Removing mineral deposits on exterior
Something that I have had success with is plain white vinegar -- it can be used straight or mixed with water. For heavier deposits straight white vinegar heated slightly and rubbed on with a sponge should dissolve most water deposits without harming the aluminum -- as with moth cleaners, rinsing after application is always a good idea.
Kevin D. Allen
WBCCI (Lifetime Member)/VAC/Free Wheelers #6359
1964 Overlander International/1999 GMC K2500 Suburban (7400 VORTEC/4.11 Differentials)
1978 Argosy Minuet 6.0 Metre/1975 Cadillac Eldorado Convertible (8.2 Liter V8/2.70 Final Drive)