Yeah, bad idea. Besides the whole issue of getting wet, carpet can be a magnet for the kind of dirt that cleans up off a "bare" floor. I used to detail in the dealership's showroom when I had that building and the carpeted area was a hassle compared to the uncarpeted part. From polish dust, to dirt, to you-name-it (wait until you spill a liquid polish/wax on it :rolleyes ), the carpet was a real PIA.