When cleaning isn't enough, the usual cure for grimy grout is to grind it out and regrout (see Tips for Removing Grout). But here's an easier approach: DAP Kwik Seal Grout Recolor Kit (available at home centers or online) lets you put a fresh coating over old grout in a few hours. It's a four-step process. First, you clean and prep the grout with DAP Pre-Treat. Next, apply the Color+Seal coating. Remove the excess and then buff off the haze. The kit contains everything you need and covers about 100 sq. ft. of 4-in. tile (smaller tile will have more grout lines and require more material). Learn more at dap.com.
You'll need a sponge and rubber gloves.
Avoid last-minute shopping trips by having all your materials ready ahead of time. Here's a list.
- DAP Kwik Seal Grout Recolor Kit