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I have no experience with redwood trees. WD40 is effective for a wide variety of sticky removal chores. If that doesn't work, try each of these in a small test patch:
- Alcohol-based hand sanitizer - Let it sit, don't let it dry out. Alcohol is a good solvent for most sticky stuff from trees. An alternative would be to try isopropyl alcohol straight.
- White vinegar (straight) - Acetic acid may take it off.
- Pine Sol - Straight - It's a terpene based cleaner and may soften the residue.
I think any abrasive action will damage the paint.
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