I installed 2 Drake CST744SG's barely a year ago and really like them. A couple of problems though. The chrome on flush knobs are bubbling and the plastic "spud" that goes through the tank holding the flush knob on one of them has broken where the nut threads on. I just got done speaking to Toto tech and they are sending the parts, as a courtesy! Not covered under warranty. I would expect these items to have a better design life for the money!
Presto, has anyone used any cleaning materials that might have caused the bubbling (as in anything other than simple soap and hot water?) If so, what material was it so that I can avoid the problem? Thanks!