I can’t get black marks off my white vinyl fence... used mr clean sp
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http://www.howtocleanstuff.net/how-to-clean-vinyl-fencing/
If marks are petroleum based, use Goof Off to get rid of them. It's also possible the marks are stained into the vinyl. Use paint designed for plastic and go over the marks. Good luck.
mr clean magic sponge worked for us
If it is white try a little cleanser.
Call animal control