Just bought some used wheels to replace the wrong size on my truck. Some were covered with shop dust so thick you could not see the finnish and some have mud on from being stored outside. Only got some done and outside cleaning up good with just a brush and water hose. Now problem is the inside they are covered with grease like a bearing throwing it out, spots heavy enough to affect balancing new tire. What is best to get that grease off without dammaging the aluminm, I don't care on inside about color but do not want to discolor the outside. Just want clean enough it does not affect the balancer. What to use? And the used rims cost from $30 to 35 each. and had to go a hundred mile to get 3 of them with 35 mile for the other 2. Hard to find my size as most are an inch to wide for correct tire for the truck. And tire dealer said that overwidth rim would probably void the warenty on the new tires.