Work on a clean surface
Wash and dry the area, then inspect in good light. A mineral deposit on top of the finish and a mark etched into it can look similar. Do not begin with aggressive polishing solely because ordinary shampoo left a spot.
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Test the appropriate chemistry
Use a water-spot product approved for the actual surface, following its label and a small test area. Keep it off excluded materials and do not let it dry. A product described for glass and paint still has application instructions and limits.
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Stop when cleaning stops helping
If the deposit is gone but a mark remains, assess the finish before removing material. Thin paint, prior repairs, matte surfaces and coated glass need particular care. Avoid making one stubborn spot into a larger polished patch.
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Sources / references 1
- Manufacturer care guidance ↗Reviewed Oct 6, 2026
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