We have an old product up here called CLR (Calcium, Lime, Rust).
People use it in dishwashers, washers, and COFFEE MAKERS!
Never used it, but this is like a 30 year old product so they must be doing something right.
Falken - Draftsperson
2010 Honda Fit DX-A in Black
Current Fill: Formula 1 Synthetic 5W20 SN, Wix 57356 Oil Filter, ATF DW-1