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Monday, December 30, 2019

Stain Removal; Polishes Not Acids

Once window glass has become stained by hard water/mineral deposits it has been damaged.  Simply put there has been an exchange of atoms between the glass surface, water, and the minerals/salts in the water.  One way to effectively and completely remove all of the mineral deposits is with a super abrasive polish.  These polishes are usually based on a cerium oxide, silica, zirconium oxide, or diamond.   The application of these polishes are done by hand or with a machine and a variety of different pads.  The restoration professionals out there such as Marc Tanner focus on polishes.  I have had many conversations with Marc over the years.  He always tells me that every job is different.  So the most effective technique requires trial and error.  In my opinion "precision" stain removal can only be accomplished in the field with a technique based on a super abrasive polish.  Not with an acid.  There are many problems with acids that can very easily and very quickly cause damage to the glass that cannot be easily repaired.  So even though acids such as hydrofluoric, sulfuric, and ammonium bifluoride will quickly remove mineral deposits, they do react with the glass every time, and can do damage to the window that can bring in a lawsuit.

Written By Henry Grover Jr.
henrygroverjr@gmail.com

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