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This was a tip my dad had learned from a professional car detailer:
Bon Ami cleaning powder is excellent for buffing car windows and also to remove tar and other sticky substances from car surfaces, including painted areas. However, don't use other "scouring powders" - Bon Ami is the only one that won't scratch a surface even with hard scrubbing.
I've used it many times, and it gives wonderful results.
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