So been going to brushless car wash and noticed stains on black aluminum alloy -window frame. Tried wd 40, back to black restorer, turtle wax-nope they only lasted 2 days tops. Went to car wash-boom stains Bach. So the chemicals in soap remove ph balance science crap Yada yada yada, then tried stainless steel cleaner, yup the stuff u clean the outside of yr fridge with……and it seems to be working.