I just bought an ARS rack system, just wondering if anyone has ever replaced the tubs? I have a half stack of ARS-7030 and a half stack of ARS-8018 on top of each other. Do the tubs with the clear fronts ever break / scratch / wear out / discolor? How about the tubs with no clear front, anyone have problems with them picking up bad smells that you can't get rid of over time? Does bleach hurt them? Just wondering about their usable life...