Ultresonic
Mr. Dave Sir, I canot speak for others but I have had no bad experiences using the Lyman cleaner and distilled water. It does not remove patina or colors. The colors are very vibrant after cleaning. I did have one bad experience using tap water and Dawn dish washng liquid. That episode left splotches of clear places on the receiver. I tent to think it was caused by the minerals in the water but it could have been the chemicals in the Dawn, or a combination of both. I don't know. I'm glad the owner is a friend. I do know I will use the Lyman product till the cows get mad and leave for a better place. In fact, I just ordered a gallon of the Lyman metal cleaning product. I am very impressed with it. Cheers, Tom
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