My car's paintwork has been damaged by parking under a leaking air conditioning duct. The car is now covered in a hardened chalky coloured martial , a bit like limestone.
It came off the windows OK using a stanley knife blade but I can't shift it off the paintwork. So far I've tried soap, petrol, white spirit, T cut, polish, vinegar and Cillit Bang.
Any other suggestions????
Thanks
Peter
Probably is limestone residue, try kettle descaler, (on unimportant paint site first)
As a last resort, rubbing compound or wet/dry paper - use a block and plenty of water
And dont forget to lubricate with soap
I wonder if a clay bar would work?
What you need is a chelating agent that dissolves calcium salts. Have you tried CLR or any of those other shower nozzle, electric kettle etc. cleaning products? Another method might be to wet the area with bicarbonate of soda solution (very mild alkali which turns the calcium to calcium carbonate), let that dry then wash that of with acetic acid (vinegar, a very mild acid which fizzes a bit as the acid dissolves the carbonate). It cleans oxide build up off ceramic tiles and glass and it's not abrasive so it won't hurt paintwork.
Graham L
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