I;ve used CLR, and it works fairly well, but doesn't get all the calcium
crud off here in limestone central. I suspect that in Texas, it's even
worse.
I've used diluted muriatic, as it is readily available in places like Ace
hardware, as it is used in swimming pools, but phosphoric would be better.
Phosphoric is the acitve ingredient in the strongest tile cleaners.
Don't know how it is on plex, but I think that in the normal dilutions,
there isn't much to worry about.
Bill Pearce
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