ValetPro Bilberry is an outstanding acid free wheel cleaner. Its one of the most effective products and rates highly from the people who have used this. Your wheels can take a battering whether it's brake dust, salt or just general road dirt and this product doesn't need to be agitated, just spray on, leave for a few minutes then rinse off.
It's a concentrated formula that can be used a different strengths depending on the level of dirt to be removed. It can be used concentrated for really caked on grime or as little as 10:1 for general maintenance.