Honda GL1800 2004 Owner's Manual page 173

Appearance Care
Aluminum Wheel Maintenance
Aluminum may corrode from contact with dirt, mud, or road salt. Clean the
wheels after riding through any of these substances. Use a wet sponge and mild
detergent, or a commercially-available spray cleaner/degreaser designed for use
on aluminum. Avoid stiff brushes, steel wool, or cleaners containing abrasives
or harsh chemical compounds.
After washing, rinse with plenty of water and dry with a clean cloth. Then apply
a mild, commercially-available spray cleaner/polish or wax.
For stained or dull-looking wheels, use a quality chrome/aluminum polish to
restore the finish.
After you finish cleaning the wheels, it's important to check for and remove any
cleaner or polish residue found on the brake discs or pads. Use Honda Contact/
Brake Cleaner or an equivalent brake degreasing agent.
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Servicing Your Honda