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Before you begin caulking a shower, you’ll need to use a utility knife or solvent to remove the old caulk and inspect the area for mold. If needed, take appropriate steps to get rid of the mold, then wipe everything down with dish soap and warm water before letting it dry completely. Finally, surround the caulking area with two strips of blue painter’s tape—one above the joint where you’re caulking and another below it.

Yes, you can use household cleaners on silicone caulk, but opt for mild, non-abrasive cleaners. Solutions like vinegar and water are effective for tackling mold and dirt. Avoid cleaners containing ammonia or harsh chemicals because they can damage the caulk. Always test a small area first to ensure the cleaner doesn’t cause any adverse effects.

New grout applied over old grout typically doesn’t last as long as grout applied to a clean, prepared surface. If you run into problems like your new grout not adhering well to the old grout, you may see your new grout chipping or cracking within just a few months. For the best longevity, it’s recommended to remove old grout before applying new grout.

While vinegar can remove some adhesives, it may not work at removing floor tile adhesives. Floor tile adhesives are particularly strong in order to hold up to foot traffic, so vinegar may not be powerful enough to remove them. However, if you use peel-and-stick tiles for your kitchen backsplash or mudroom floor, vinegar may help clean up any adhesive residue from those types of tiles.