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In almost all cases, yes. Most grout is cement-based, meaning it’s highly porous and susceptible to mold, mildew, and grimy deposits. Grout sealer is a crucial step if you’re looking to preserve the look and structural integrity of these types of grout. However, some types of grout—such as epoxy-based grouts—are not porous and do not need to be sealed.

You can definitely regrout your backsplash without removing the tile. Much like regrouting a tile floor, you’ll have to remove the original grout carefully with a grout removal blade on a multi-tool or a dremel tool, being careful not to damage the surrounding tile. To get all of the grout, you’ll probably have to use a utility knife to get any stubborn pieces. Once the grout is removed, you can clean the area thoroughly and then add your new grout.

While it’s still best to install waterproofing materials behind the tiles, you can still add better water protection to your shower without any demo work. Start by softening and removing old grout and installing new grout, then seal the grout and caulk the shower to help seal any gaps and prevent leaks.

If you prefer not to use a commercial cleaning product on your pink mold issue, or on other types of mold you are seeing in your bathroom, there are some natural mold killer products that you can use. You can try substances that you may already have in your home, like vinegar, tea tree oil, hydrogen peroxide, lemon juice, and baking soda.