Flashingnose - I did actually try Klear a year or so ago: I used to use it on some horrid lino at our old house. But on these tiles (sorry I don't know what they are called) it didn't seem to work, it didn't seem to put a protective film on them, rather it seemed more to be, I don't know, absorbed or something!
I have a steam cleaner and cleaning tiles is the one thing it's really good at. Gets the dirt out of all the little dents and grooves. So the equivalent of your get down and scrub but without the hard work and every time you clean. Sealants don't seem to do anything much IME.
They're great for cleaning hard floors, spot cleaning upholstery amnd carpets (but not overall cleaning of either) and car wheels. They're not much cop at the other jobs they claim to be good at (or at least other things are much better at things like cookers and bathrooms).
Worth paying for a reasonable amount of steam pressure but you don't really need lots of attachments and gizmos.
I got mine from here .