RE: Zero StatI tried one in the store back in the late '70s and it always clicked and I couldn't get it to work. I figured I didn't know how to use it. But then I always intensely disliked Discwasher and their fluid...
In the older disc cleaning post I mentioned I had the original ZStat. It never seemed to do much unless I pressed it someones arm & pulled the trigger. Big fun. Jump froggy!