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Looks like you suffer from some bad acid rain and contamination more than bad paint. It'd be one thing to have an etch-prone clear-coat, but if you're paint protection film is getting hammered as well, it speaks volumes about the type of damage you're up against.
I'd recommend you start using a carnauba wax over your Zaino. Sealants are great, but they don't seem to resist etching damage as well as wax IME. The problem is the wax is truly a sacrificial barrier and will need to be kept up much more vigorously. Reapplying a thin layer every month or 90 days is preferred.
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