Mike, I got into tile and grout cleaning about a year ago, not because I wanted to, because my existing customers were requesting the service. I’ve had no regret thus far. In fact, I just booked a natural stone and grout cleaning/sealing job today after cleaning a “new” customers carpet. I estimate the time to clean and seal will take approximately 3 hours, 500 sq. ft. total. Clean one day and return the next to seal. The price, $500.00. And, I’m giving her a great price at that! The down side, it really takes two people for this type of cleaning, one to scrub, one to rinse, etc… all in all, it a good service to add to your business. Hope this helps.