Yep, bird bombs can be deadly to your clear coat for a couple of reasons.
Their little systems are full of some pretty nasty digestive juices to dissolve things like insect exoskeletons, seeds, and plant matter. That translates to some pretty acidic turds.
Add to that some birds eat small pebbles to help in digestion, and some of the bug bits aren't fully digested when they leave their system. Now not only is the stuff gonna etch your paint, but if you're not careful about how you remove it the wiping action could lead to swirls and/or scratches.
I use my Waterless Wash sprayer on 'stream' and use that to knock as much of the matter off of the finish, then saturate the spot on the spray setting making sure to flip the towel with each pass, until the entire bomb is gone.
I try to follow that up as soon as possible with a fresh coat of wax to restore the protection to the surface.
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