I bought a Schroth harness from a former Mini owner. It is great condition, but looks as if it was regularly handled with greasy hands and stored on the floor of the garage! What is the best way to clean it? I was thinking of agitating it in a 5 gallon bucket with warm water & laundry detergent and letting it soak overnight. Anybody have any other ideas? It has too many metal parts to wash it in the washing machine.