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BTW: Could I just wash my car with soap and water instead of mineral spirits?



I would think not. The soap could still leave a residue that would potentially affect the paint.

I realize you are on a budget, but I think that the mineral spirits was only about $10. It goes a long way - its not like you are going to pour it in a bucket and slop it on like you are washing your car.

You are just going to get a rag damp with it and start wiping down the metal.