Hi Kevin,
Thanks for that.
I use about the same thing now.
Phosphoric Acid Cleaner from Lowe's, made by Aqua Mix Co.
In the ceramic tile department.
As you said, follow safety instructions.
After dipping stop the action with a dip in a baking soda/water mix.
Best, John.
John Barraclough
5/10/2008 2:40:00 PM

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