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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.

After cleaning your grout, you should let it dry for at least 24 hours to make sure all of the moisture has evaporated before doing any resealing. Sealing your grout before it’s completely dry will lead to even more work because you’ll have to do it all over again. The sealant won’t stick to damp grout; it will just peel off.

You can tell if your grout needs to be regrouted or replaced if it shows signs of cracking, crumbling, or has gaps between the tiles. Other key indicators include persistent stains, discoloration, mold, or mildew that cannot be removed with regular cleaning. If the grout feels loose, powdery, or chips away during cleaning, it's time to consider regrouting to maintain the integrity and appearance of your tiled surfaces. Keep in mind that partial regrouting can be a more affordable option for a quick refresh without needing to do the entire area.

Grout haze will appear within a few days of tile installation and should be removed as quickly as possible. That said, if caught early, grout haze can be left overnight while you gather supplies or make arrangements for it to be cleaned—but the grout haze will be more difficult to remove the longer it is left.