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my method that I've used for years is dishwashing liquid and a soft cotton cloth. I wouldn't use alcohol because it is a solvent. Rinse well, then follow up with clean water and a "discwasher", basically a piece of lint free velour cloth wrapped around a soft tube, a short chunk of pipe insulation foam is a good choice for the tube if you don't want to pay 10$ for the "pro model". Use distilled water if your water is overly "soft or hard"
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