does any1 have any neat and easy ways to clean the radiator fluid reserve bottle without draining? had the shop change fluid when it was there now the bottle has scaley crap covering the sides cant tell what fluid looks like seems it looks worse than before not sure if i should change it again but either way i would like to scrub down sides of the see through bottle. Bend a toothbrush and scrub? how will scrubbin that stuff off affect my radiator when it comes loose.