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Don't use the dam water as it have dust in suspension ( abrasive) if you have plenty of distilled water, use it. I like to have it luke warm with a few drops of detergent. you can softly drag soaked cotton balls across a stuborn stains although as lightly as possible.
After rinsing I get pure tissue ( non scented non colored etc) and shape it into the shape of a pensil and touch each drop on the surface with the tissue and their gone. Just a quick blow with a hair drier (a clean one, no dust etc) to make sure it is 100% dry.
good luck
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