To get the paint off the windows I'd use a regular glass cleaner or a solution of baby shampoo and water and a single edge razor blade, like the kind that goes in a box cutter, not a utility knife. Spray the window really well and use the razor blade to scrape the paint off the window. Use enough cleaner to lubricate the window enough so as to not scratch the glass. As for the wheel wells, and I assume you're talking the insides and not around the wheel wells, I'd use Simple Green. It works pretty well and won't asphyxiate you.
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