I've used Purple power as well, and the Walmart generic version. They work great but as the OP said, they will eat your skin. I got some in a small cut and it burned like no other. My friend tried using it without gloves and it actually ate his fingernails. They were almost as soft as skin afterwards.
The lesson is children: Wear heavy duty gloves.
Oh and I can't verify it but I heard from someone today that vinegar and cream of tartar(you can find it in the baking aisle at grocery stores usually) just destroys grease.
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