Let me just say that "unclicking"the floor tiles, especially in large sections, is a huge pain in the ***. First, they aren't easy to unclip. Secondly, large sections of the floor tires are surprisingly heavy to drag out of the garage. And finally, clipping them back together in large sheets is also a big pain. Once side will go together quite easily, but for the other side, you'll have to lift the existing tiles up to slide the tiles you're snapping back into place underneath. It may sound easy, but it's not. Working with big sections just makes it even more difficult.
That's why I came up with my surface cleaning/pressure washer solution. And to be completely honest, I've found that the Free Flow tiles don't even need to be cleaned very often at all. I clean mine once a year at most, and that's usually just to get all the salt and road grime out of my garage after parking the cars in the garage all winter long. All the **** from snow melt/slush ends up on the floor, so I usually clean the floor once time in the Spring and then nothing to clean again until next Spring.