I'd be worried about if there's ash from the burn off that then mixes with water to become lye. Not sure if there's more of a chemical reaction necessary than that.
I had a vinyl wrap on part of my car and some ash from California brushfires fell on it, and then it rained a month or so after (I was procrastinating on properly washing it off) and the lye produced ate through the clear coat of the vinyl.
I'd be worried about if there's ash from the burn off that then mixes with water to become lye. Not sure if there's more of a chemical reaction necessary than that.
I had a vinyl wrap on part of my car and some ash from California brushfires fell on it, and then it rained a month or so after (I was procrastinating on properly washing it off) and the lye produced ate through the clear coat of the vinyl.