My kitchen floor is probably 20 years old. The grout was stained and the floor never looked clean because I could not get the grout clean. The deep cleaner is amazing!! It is a workout only because you need to bend down a lot to do this, but it is well worth the effort. I had a problem with the sealer, I called the company, the owner called me back personally and they are sending me a new sealer. I will be working on my bathroom next. It really is wonderful when something works like it says it does!!