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The most effective method uses specialized cleaning solutions and equipment to loosen dirt and stains, followed by high-pressure rinsing and steam cleaning to sanitize and restore the tile and grout's original appearance.

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.

You can test whether your grout needs to be sealed with a water droplet test. If water beads up on the grout’s surface, it’s likely been sealed (or might not need to be). On the other hand, if the water gets absorbed or causes the grout to darken, then it’s time for a fresh grout sealing.

Sanded grout contains particles of sand, making the grout more resistant to cracking. This durability makes sanded grout well suited for tile floors. It is also less prone to thinning out and forming bubbles when it cures, so you can spread it into larger joints.

Unsanded grout is much smoother, so you will want to use it when working with tile made from glass or polished stone. Any sand could leave scratches on the tile’s surface. The lack of sand also makes unsanded grout thinner, making it best for tile joints that are less than one-eighth-inch thick.