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You want the bonding process to get started but not finish before wiping away newly applied grout. That process takes about 15 to 30 minutes. Use a wet cloth or sponge to remove the grout, but keep in mind that it will continue to dry and cure. Drying and curing times vary by the type of grout, so read through the instructions to know when it’s safe to walk on or use the room in which you tiled.

Dust mops are the best option for tackling dirt and dust on marble floors. Vacuums aren’t a good idea as the brushes and beater rolls can scratch and damage your marble floors. If you must use a vacuum, make sure your vacuum has a setting for hard floors, and take care not to apply too much pressure when rolling the vacuum across your marble floor.

The easiest way to tell if your grout requires sealing is to look at it. If it looks dirtier than normal or the grout gets dark when wet, chances are the seal has broken, and resealing is necessary.

Unlike sanded grout, unsanded grout doesn’t always require sealing. But it’s a good idea to seal it anyway—especially in moist or humid areas (like bathrooms) or high-traffic spots—to protect it from dirt, mold, stains, and damage. On average, hiring a pro to seal grout costs between $150 and $250 for a 160-square-foot space.