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I have never seen this happen, but you must have some sort of electrolysis action going on to make the metal corrode away so quickly. This is not the fault of the washer as the water valve is plastic and cannot conduct electricity. Try using plain old rubber fill hoses OR get some pipe insulation and cover your stainless braided hoses with it so there is no metal-to-metal contact. As long as the hoses are electrically insulated then this should stop your oddball problem.