The other day I was thinking that I had to get to Publix before the sale was over to get some boxes of 2000 flushes. I waited until the last minute and they were all gone. I got thinking about how cool I thought it was when I was a kid and my Mom would put the tablets in the toilet that would turn the water blue or green. I never see green now (and who would want it...it would look like pee!), but I have seen purple. Anyway, this is where this is leading...I'd have to say colored toilet cleaner tabs (or whatever they're called)...Some more things that come to mind...
ATM's, Coca-Cola, garage door openers, the Ped Egg, air conditioning, Mr. Clean Magic Eraser, razors, White Out...
~Lisa