We bought an existing home 2 yrs ago that at that time was 18 yrs old. I don't believe the white tile and grout throughout the entire home (2,060 sq ft) had ever been professionally cleaned and resealed. Pro Clean did a terrific job! All rooms with the exception of the kitchen are 100% better. The kitchen is a high traffic area and looks 95% better. We knew the kitchen wouldn't be 100%. To assist and make it easier for the service rep to perform his cleaning, we moved all portable furniture to our patio and garage to make it easier for the service rep which worked quite well. The grout sealant was applied from spray cans--about 6 were used. The only thing is that even 1-2 days after, you can see where it was sprayed on as evidenced on the tile, so I mopped with warm water so it doesn't leave marks. If you don't use Pro Clean to clean tile and grout, you're making a mistake! They are the best!