After approximately one month of use, the mat became unclean due to sweat and other skin secretions (I don't eat when working on the computer). It goes without saying that you cannot wash it, as there are good reasons for this. On the other hand, some types of mild soiling can be removed with regular wet wipes. In addition, I did not measure the carpet before purchasing it; I simply wanted it and went ahead and got it. In point of fact, it ended up being a little bit narrower than I had anticipated it to be. Although it is not essential for me, I would advise everyone to take measurements before making a purchase.