I have encountered a problem with a customers sliding glass patio door. It is double pane tempered and has a coating of film on the exterior side. It is a seaside unit and as such I thought it had hard water buildup as regular cleaning scrub/squeegee, didn't work. I used crystal clear 550 by Winsol and it completely clouded up the glass, ten times worse that it was. a PGT rep in Cayman said it might be low E coating but I was made to understand that low E would not be on the exterior side. I need to repair what I have done even if it means taking off the coating but this coating is not just tint and it doesn't just come off. If unsuccessful I will need to replace the sliding door. one of three. I only damaged one. whew, Any suggestions. Glass manufacturers have proved useless so far.
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