What to do
Wash and dry the vehicle promptly after suspected acid rain exposure. If a mark remains, identify whether it is removable surface residue or damage to the finish before choosing a specialist product. A cleaner cannot be assumed to reverse paint etching.
Step-by-step
Wash the affected exterior
Use the vehicle maker’s washing guidance and a car-wash product suitable for the finish. Remove loose dirt before wiping so it does not abrade the paint.
Dry and inspect the finish
Dry the washed area with clean, appropriate materials. Check whether the mark is still visible and whether it appears to sit on the surface or has affected the finish.
Check a specialist product before use
An acid-rain or water-spot remover needs product-specific directions and confirmation for the exact paint, glass, coating, or trim involved. Test and apply only as its approved instructions allow.
Get paint-care advice for persistent marks
If washing does not resolve the mark, ask a qualified detailer or paint professional to assess it. Chemical cleaners are not a substitute for repair of an etched finish.