Top Grout Removal Tools and How to Remove Grout with an Oscillating Multi-Tool

Step-by-Step Guide: Removing Grout with an Oscillating Multi-Tool

Using an oscillating multi-tool is one of the fastest and most effective ways to remove old grout. Here's a streamlined guide to help you complete the job safely and efficiently:

1. Gather Your Tools and Safety Gear

Prepare your tools: an oscillating multi-tool, a suitable grout removal blade (carbide for standard grout, diamond-coated for hard or epoxy grout), and safety gear like goggles, a dust mask, gloves, and ear protection. Keep a vacuum or broom nearby to clean dust as you work.

2. Install the Blade Properly

Ensure the tool is unplugged before changing blades. Choose the correct blade and attach it securely—carbide blades work for most jobs, while diamond blades are best for tougher grout. Make sure the blade is aligned and tight.

3. Start Cutting

Put on your safety gear, power up the tool, and set it to medium speed. Hold the blade at a slight angle (around 30°) to the grout line and guide it gently. Let the tool do the work—don't force it. You may need to make multiple passes for deep or wide joints.

4. Clean Out Residual Grout

Use a manual grout scraper or chisel to remove any remaining bits, especially in corners or tight spots. Vacuum the area thoroughly to clear out all dust and debris.

5. Inspect and Prepare for Regrouting

Check for loose or damaged tiles. Fix any issues before applying new grout. Finish by wiping the area with a slightly damp cloth, then let it dry completely. Clean, dry joints ensure the new grout will bond properly.

By following these steps, you’ll have a clean slate for applying new grout. An oscillating tool greatly speeds up the process, and careful preparation afterward sets the stage for a long-lasting grout job. Next, let’s look at some of the best blades and tools you can use to make grout removal even more efficient.

Best Blades and Oscillating Tools for Grout Removal

Choosing the proper blade (and a quality oscillating tool) can make grout removal easier and extend the life of your equipment. Not all blades are created equal, especially when it comes to tackling different types of grout. Likewise, some oscillating multi-tools have features that stand out for this kind of work. Here we highlight a few of the top-performing blades and oscillating tools that professionals often recommend for grout removal:

Best Grout Removal Blades for Oscillating Tools

• Diablo Carbide Grit Oscillating Blade: Diablo’s carbide-grit blade is known for its durability and broad compatibility (it fits most oscillating multi-tool brands). This blade is a great all-purpose choice for standard grout removal jobs. The carbide grit effectively grinds out typical cement-based grout without wearing down too fast. It’s a reliable, cost-effective option to keep in your kit for everyday use on ceramic or porcelain tile projects.

• Dremel MM502 1/8-Inch Grout Blade: If you’re working in tight spots or with very narrow grout lines (for example, on a backsplash with small tiles or detailed mosaic work), the Dremel MM502 is a handy blade. It’s designed to be slim (1/8-inch width) for precision work. This high-precision blade allows you to remove grout from between even the smallest tiles without damaging them. It’s perfect for detail-oriented tasks where larger blades might be too clumsy.

• Bosch OSL312DG Diamond Grout Blade: Bosch offers a premium diamond-grit oscillating blade, model OSL312DG, which is excellent for the toughest jobs. Diamond-coated blades are your best bet for epoxy grout or very hard old grout that carbide blades struggle with. This Bosch blade has a segmented shape (a half-moon design) which helps in getting into corners and against edges. It will last longer and cut faster on really stubborn grout. For contractors dealing with a variety of grout types, having a diamond blade like this on hand is a smart move.

Best Oscillating Multi-Tools for Grout Removal

• Fein MultiMaster 500: The Fein MultiMaster series is often considered the gold standard among oscillating tools, and the Model 500 is no exception. Professionals praise it for its superior build quality and low vibration. It has a powerful motor that maintains speed under load, meaning it won’t bog down when you’re pressing into hard grout. The Fein also features quick blade changes and excellent ergonomics for comfort during extended use. It’s a corded tool, ensuring consistent power output, and it’s built to withstand daily use – which is why many contractors invest in Fein for the long run.

• DeWalt DCS356B (20V Max XR Oscillating Tool): If you prefer a cordless option, the DeWalt DCS356B is a top choice for grout removal tasks. This 20V battery-powered oscillating multi-tool delivers plenty of power without the cord, giving you freedom to move around a job site. It features a 3-speed selector, so you can set the oscillation speed to match the material (and manage dust or precision). DeWalt’s tool-free blade change system makes swapping grout blades easy. With a good battery, you’ll get a solid runtime that can handle small to medium jobs on a single charge. It’s known as one of the best battery-powered oscillating tools for both professionals and serious DIYers due to its balance of power, convenience, and DeWalt’s rugged build quality.

• Makita TM3010C Oscillating Multi-Tool: Makita’s TM3010C is a powerful corded oscillating tool that many pros choose for its reliability. It offers electronic speed control to maintain constant speed under load (useful when cutting tough grout so the blade doesn’t stall out). The variable speed dial and soft start feature give you fine control when starting cuts. Makita’s ergonomic design and moderate weight help reduce fatigue during long periods of grout removal. For contractors who need robust and consistent performance, this Makita model is a trusted choice that delivers steady power all day long.

All of the above tools and blades can greatly assist in grout removal tasks. If you’re outfitting your crew or stocking your store, these are proven options that get the job done efficiently.

Alternative Methods: Removing Grout Without an Oscillating Tool

What if an oscillating multi-tool isn’t available? While oscillating tools are preferred, there are alternative methods to remove grout. Depending on the project scope and what tools you have on hand, you might consider the following:

• Rotary Tool: A high-speed rotary tool (like a Dremel) with a small grout removal bit can be used for removing grout in a pinch. This method gives you ultimate control for intricate sections and very tight areas. It’s effective for precision work, such as cleaning out a hairline grout crack or detailed tile patterns. The downside is speed – rotary tools are relatively slow at removing large volumes of grout and can overheat if pushed too hard. Use this method for careful touch-ups or small jobs rather than an entire room.

• Angle Grinder with Diamond Blade: For those needing the fastest removal method on large jobs, an angle grinder is an option. By attaching a diamond-tipped blade (often a small diameter disc designed for grout or mortar), you can cut out grout lines at lightning speed. This approach is really only suitable for very large, open tile areas and for those with a steady hand. Extreme caution is required because one slip can damage a tile or even cause injury. Also, angle grinders create a lot of dust and noise. It’s overkill for most projects unless you truly have to remove grout from a very large area quickly. Always wear full protective gear and consider having a helper with a vacuum to catch dust as you grind.

• Manual Grout Removal (Grout Saw/Rake): As mentioned earlier, you can always fall back to hand tools like a grout saw or grout rake if power tools aren’t an option. This is the most labor-intensive method, but it works for small areas or delicate jobs. For instance, if you have just a few bad grout lines to fix, using a manual grout saw might be perfectly reasonable. It’s quiet, cheap, and there’s virtually no risk of electrical hazards or major tile damage (as long as you work carefully). Just be prepared for a workout, and take breaks as needed to avoid straining your hands or wrists.

Each of these alternative methods has its place, but they generally require more time or carry other trade-offs. Many professionals will use them only if an oscillating tool isn’t practical or available. In a professional setting, you might use a combination of methods – for example, using an oscillating tool for the bulk of the grout and a rotary tool for the corners and fine details.

Common Problems & Solutions in Grout Removal

Even with the right tools, grout removal can pose a few challenges. Here are some common problems you might encounter on the job, along with ways to solve them or prevent them from happening:

• Accidentally scratching or chipping the tiles: It’s not uncommon for a blade to slip and nick a tile surface or edge. To minimize this, consider using a grout removal guide (an attachment that comes with some oscillating tools to keep the blade at a consistent depth and distance from the tile surface). Also, always keep the blade at a shallow angle and work slowly near tile edges. If you do notice minor scratches, you might be able to polish them out later, but prevention is key. Taking your time and not forcing the tool will greatly reduce tile scratches.

• Blades wearing out too fast: Grout can be tough on blades, especially if you’re dealing with epoxy or old hardened grout. If you find your standard carbide blade is dulling quickly, the solution is to invest in a higher-quality or more appropriate blade. Diamond-coated blades last significantly longer when cutting hard materials – they may cost a bit more upfront, but they maintain their cutting efficiency and will save money in the long run on big projects. Also, avoid pressing down too hard which can overheat and wear out any blade faster; let the speed of the tool do the work.

• Too much dust being produced: Removing grout will inevitably create a lot of fine dust. This dust can obscure your line of sight, make cleanup difficult, and even pose health risks if inhaled. To combat dust, many oscillating tools can be connected to a vacuum dust extraction system – if your tool has this feature, use it. Otherwise, keep a shop-vac hose nearby to suck up dust as it’s created. Another trick is to lightly mist the grout lines with water from a spray bottle before cutting. The water will help keep dust from flying up (it clings to the moisture and settles), but be extremely careful with water around power tools – do not soak the area, just a light mist will do, and of course avoid spraying water directly into the tool. Always wear your dust mask or respirator and safety glasses. Good ventilation (open windows, a fan blowing out) will also help keep the dust from lingering in the air.

By anticipating these issues, you can prepare for them. Use the right attachments, blades, and protective measures to ensure your grout removal goes as smoothly as possible.

Safety Tips for Grout Removal

Whether you’re a DIY enthusiast or a seasoned contractor, safety should never be overlooked. Grout removal can be dusty and involves power tools, so take the following safety precautions before and during the job:

• Protect Your Eyes: Always wear safety glasses or goggles when removing grout. Small bits of grout and tile can eject and become airborne at high speed. Eye protection is a must to prevent serious injuries.

• Protect Your Lungs: Grout dust is fine and can be harmful if inhaled. Work in a well-ventilated area – open windows and use fans to circulate air if indoors. Moreover, wear a dust mask or respirator to avoid breathing in silica dust and other particles, especially if you’re removing a lot of grout or working in a confined space.

• Use Hearing Protection: Power tools like oscillating multi-tools and grinders can be loud. Over extended periods, this noise can damage your hearing. Wear earplugs or earmuff-style hearing protection when using loud equipment, particularly on big jobs. Your ears will thank you.

• Wear Gloves and Appropriate Clothing: Grout edges and broken tile pieces can be sharp. Wearing durable work gloves will protect your hands from cuts and also give you a better grip on vibrating tools. Likewise, consider long sleeves and pants to protect your skin from flying debris.

• Take Your Time – Don’t Force It: A common mistake is getting impatient and pushing the tool too hard or trying to rush the process. This can cause you to lose control of the tool, potentially damaging tiles or injuring yourself. Instead, use controlled, steady movements. Let the oscillating tool’s blade do the cutting at its own pace. If you find yourself needing to exert a lot of force, something is wrong – either the blade is dull, you need a different blade type, or you need to adjust your angle. Slow and steady is safer and actually often faster in the long run, because you’ll avoid accidents and rework.

By following these safety tips, you ensure that the grout removal process is not only effective but also injury-free. A professional job is a safe job!

Frequently Asked Questions

Can I remove grout without power tools?
Yes, you can use manual tools like grout saws and rakes. They're great for small touch-ups or tight spaces, especially if you prefer avoiding power tools. Just note it takes much more effort and time, making them less practical for larger projects.

What is the fastest way to remove grout?
An oscillating multi-tool with a carbide or diamond grout blade is typically the fastest and most efficient method. For big, open areas, an angle grinder may be even quicker—but it carries a higher risk of tile damage and produces a lot more dust.

Which grout removal tool is best for beginners?
Manual tools like a grout saw offer more control and are safer for those new to grout removal. But if you prefer power tools, a variable-speed oscillating tool is a great beginner-friendly choice. Start slow and steady for the best results.

How can I avoid damaging tiles while removing grout?
Use the right blade size, work at a slight angle, and apply light pressure. A depth stop or guide helps prevent blade slips. Manual methods benefit from placing a small guard (like wood or plastic) next to the tile. The key is steady, gentle passes—not force.

Conclusion

In summary, an oscillating multi-tool equipped with the proper blade is one of the best solutions for fast, precise grout removal. Its unique vibrating action allows you to cut through old grout quickly while greatly reducing the risk of damage to tiles, especially when compared to more aggressive tools. Remember to always match the blade to the type of grout – use carbide grit blades for typical jobs and upgrade to diamond grit for epoxy or very hard grout – to ensure you can work efficiently without wearing out your equipment. By choosing the right grout removal method and tools for your needs, you’ll save time, reduce frustration, and achieve a cleaner result ready for fresh grout.

For high-quality oscillating tools, grout removal blades, and other professional tile-working equipment, Johnson Tools has you covered. We offer a range of contractor-grade tools and attachments to make jobs like grout removal easier. If you have any questions or need guidance on selecting the best tools for your project, feel free to contact our team. We’re always here to help contractors and distributors find the right solutions for their business. Happy grouting!