You can clean car wheels using a mix of dish detergent, water, and baking soda. The dish detergent will lift off the dirt, and the baking soda will be an abrasive agent. Do be careful if you're using it to clean alloy wheels, the abrasive agents can scratch alloy rims easily. It's safe to use on tires however. Keep in mind, dedicated car wheel cleaning products are way more effective at cleaning dirty wheels and rims. In addition, these products protect the wheels and add a glossy look.