power wash / stained glass

I pulled up in front of one of my stores today and noticed someone had power washed the overhead stucco. But the run down would not come off. Long lines where the water ran down. Also the glass was really rough. The man in charge of the crew said all they used was water. When I told him the glass looked like it was etched he said all we used was bleach. So I went to the car and pulled out a silica based stain remover. Then in front of him I cleared a circle. Nice and smooth now I said. Don't worry. If you had etched the glass this would not have worked. He was quite relieved. Of course no one will want to pay to have the stains removed. And I'm not doing it free. I did however give him some cards and told him the best thing to do to prevent this from happening again is to have the windows cleaned immediately after the building is power washed. This building was power washed this morning. The stains formed in about two hours. I have seen similar stains caused by bleach on paint. Paint does use silica. Another interesting case I came across once involved the use of a product based on sodium carbonate and sodium metasilicate. For power washing. It left a white stain all over all the windows in the house. Nothing a little diamond compound and Bounty paper towels couldn't remove. By hand of course. The diamond scratched when used with a machine. I priced the job at 12 Gs and got it. The insurance company paid me.



Henry

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