I have a general contractor I do a lot of work for, and they asked me to submit a quote to clean the tile floor for a commercial kitchen they're renovating. We typically do masonry (brick/block/stone/concrete) cleaning and restoration, but we do have the equipment (i.e. surface cleaner) and general knowledge to do the job. I was wondering though if there's a specific type/brand of cleaning chemical and sealer anyone recommends for tile and grout? There doesn't seem to be much grease on the floor, but it's a little hard to tell as there is a fair amount of dirt from years of not being used. Thoughts?