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compfet

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  1. As mrgraham never came back to this I thought I would let everyone know HCL does work. I have this problem and google finally brought me to this thread. I just happened to have some Concentrated Hydrochloric Acid from about 30 years ago so gave it a try and it has remove virtually all of it, just a light ghost is left. Method used NOTE: You need protection - e.g. gloves, mask (there will be fumes), old clothing I used an old cloth to apply the acid. Apply a dab of acid to the cloth. Coat the glass squares with the acid (best to avoid the leads as it will clean them and probably make the issue re-occur) Leave on for a few seconds Rub square with dabbed acid cloth. Clean off acid with plenty of water. Dry with a clean cloth.
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