I don't let bird lime sit for long. I do a walk around each time I get to the car and if I see any I take it off right away. I have a mf towel in the car all the time and a small spray bottle with water to rid off the excrement from the paint. The longer it sits, the more likely it would etch. I just use water but there are a lot of products out there. The detailing and washing section has lots of info about this topic.
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