I Have asked the same question of my radio club members and have gotten suggestions to use Windex followed by water spray rinse on chassis (this is the best I have heard) and also using a dishwasher (I kid you not!) followed by a low oven drying cycle (eg 250F) with the chassis wrapped in a towel. I have been cautioned about using alcohol because it may dissolve varnish and color codes from components. High heat will melt wax components. Good Luck Nick