Removing grout, mortar, and drywall mud from a bathtub can be a challenging task, but with the right techniques and tools, it can be done. Here is a step-by-step guide on how to effectively remove these stubborn materials from your bathtub.
Supplies Needed
- Grout saw or oscillating multi-tool with grout blade
- Safety goggles
- Dust mask
- Grout remover chemical
- Scrub brush or abrasive sponge
- Clean rags
- Bucket
- Grout sealant
Step 1: Suit Up for Safety
Before beginning any work on your bathtub, it’s important to wear the proper safety gear. Put on safety goggles to protect your eyes from flying debris. Wear a dust mask to prevent inhaling fine particles as you grind away old grout.
Step 2: Score the Grout Lines
Use a grout saw or oscillating multi-tool equipped with a grout blade to score along the grout lines. Don’t try to remove the grout in one pass. Make several scoring passes along each line to break up the grout. Apply light pressure and go slowly to avoid damaging the surrounding tile.
Step 3: Apply Grout Remover Chemical
Pour grout remover liquid or gel along the scored grout lines. Use a scrub brush to work the chemical into the lines. Let it sit for 5-10 minutes so it can penetrate and further break down the grout.
Step 4: Scrub Away Grout
Use a stiff scrub brush or abrasive sponge to scrub out the grout once the remover has sat. Apply elbow grease to scrub out all traces of grout from the joint. Avoid scratching the tile surface as you scrub. Wipe away debris with a clean rag as you work.
Step 5: Rinse Thoroughly
Rinse the entire tub surface several times with clean water to remove all grout residue and cleaning chemical. Check grout lines closely to ensure all grout has been removed. Let the tub dry fully.
Step 6: Apply New Grout
Once the tub is fully dry, apply new grout following manufacturer’s instructions. Use a grout float to pack it into the clean joints. Wipe away excess. Once cured, seal grout lines with a clear grout sealant.
Drywall Mud Removal Tips
- Score mud with utility knife before scraping
- Use a plastic putty knife to avoid scratching
- Apply hot, wet rag and let sit to soften mud
- Avoid abrasive scouring pads that may scratch tub surface
Mortar Removal Tips
- Chip away excess mortar with hammer and chisel
- Use rotary tool with reinforced wheel to grind away mortar
- Soak with vinegar water solution to help break down mortar
- Use wood chisel and mallet for better control and less tub damage
FAQs
How long should I let the grout remover sit before scrubbing?
Let the grout remover sit for 5-10 minutes before scrubbing to allow it time to penetrate and break down the old grout. Don’t let it sit for more than 10 minutes though, or it may start to dry out.
What is the best grout removal tool?
A grout saw or oscillating multi-tool with a grout removal blade is the most effective tool for scoring grout lines in preparation for removal. Avoid using carbide-tipped grout cutters which can scratch tiles.
Can I use muriatic acid to remove old grout?
Muriatic acid is very dangerous and not recommended. It can damage the tub surface and harm the user. Specialty grout remover chemicals are safer and more effective. Always check product instructions carefully before use.
How can I avoid scratching my tub when removing grout?
Use only plastic or nylon scrub brushes and abrasive sponges designed not to scratch. Apply minimal pressure when scrubbing. Go slowly and carefully around fragile tub materials like fiberglass or acrylic.
What is the best way to remove drywall mud from a tub?
Scoring the mud with a utility knife before scraping can help break it up. Hot water and wet rags will also soften drywall mud. Use plastic putty knives and avoid abrasive pads to prevent scratching.
How do I remove mortar from a cast iron or steel tub?
Use a hammer and chisel to chip away excess mortar. For better control, try a wood chisel and mallet. Letting vinegar water solution soak helps break down mortar. Be careful not to chip the enameled surface.
Conclusion
Removing stubborn grout, mortar, and drywall mud from a bathtub takes patience and the right techniques, but can be accomplished. With specialty tools like a grout saw and remover chemicals, along with proper scrubbing, rinsing, and re-grouting, your bathtub can look fresh and new again. Take safety precautions, work carefully around fragile tub materials, and avoid scratching the surface.