For starters you want to avoid using papertowels on clear plastic. Paper towels will scratch it easily. To help clear it up, use a plastic polish. Any brand will do. I have a small bottle of Mothers that I have had for a very long time. Use a 100% cotton rag or towel to apply and buff off.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member