So I'm trying to understand the concept of grout cleaning. I seen those white fill-in-the-lines grout filler products which look like they just paint on top of the grout lines. In this case if dirt is in the grout, it just gets painted over which is disgusting. We cleaned a restaurant floor...

I have a Restaurant interested in receiving a quote. it's roughly 1,500-2,000 sf (wasn't able to get the approximate square footage). Cleaning doesn't include the kitchen. Includes: Dining area with roughly 30 solid wood booths, and 10 marble top tables with about 40 chairs with leather...