I kinda chuckled when I read that because I was a victim of something similar albeit a bit more corrosive than the OP’s situation. So, I’m not contradicting your assertion, just offering my experience for your reading pleasure. I brought one of my prized cars to work one day last year. It has 6 layers of clearcoat over the color layers and perhaps as many coats of wax on top of all that. I only bring it in when I work half days so I can enjoy a nice cruise home in the afternoon. When I came out, I found a seabird had made a deposit on it and it had burned through the wax and most of the clearcoat! After getting over the rage, I was amazed at how fast it ate through the paint. It has never looked the same even with my best patching and smoothing effort…