get a microfiber towel and lightly spray with goo-gone, wipe the rims then clean with soap and water. This will remove any grease stains that are hard to remove. Then apply rim wax so that dirt and grime doesn't stick to the rim. See if that works.
Rim wax is a great product, you could wipe your fingers with a white glove on my rims and wouldn't find any dirt, grease or grimeThanks! Rim wax is a good idea. Yesterday I grabbed a dry microfiber and wiped the dust off. Works well for a quick clean. Then I'll detail it and use rim wax on the weekend.