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Hello Mick, I too am sorry to hear of this problem, and if there is going to be any benefit from this very unfortunate experience, it's going to be a warning to other owners to think twice about using such commercial car wash facilities. Yes, I know the current thinking that 'I'm not going to waste my time washing the car when I can get it done for me for £5/10'. So owners sit there wasting their time on their mobile phones while waiting to have the car cleaned! I have commented on here so many times about the adverse affects of cleaning chemicals (and lances) used by these establishments, that I am now even boring myself! They will take the skin off your hands, and can all these operators calculate a dilution rate of say 10/1?? In terms of your issue and its rectification? As I see it, these trims are aluminium and are finished by polishing them, and then the shine is sealed in by lacquering - I think. I believe you have ended up by the lacquer coating being degraded by the acid, leaving the actual aluminium surface subject to further localised attack by the chemical. Rectification would now be to repolish (to a level below the pits) and then repeat the (two part) lacquer coating. Practical without removal??? Might be worth taking advice from a local specialist vehicle preparation business incase they can offer some beneficial process. The question that now remains is :- if this chemical has resulted in this damage to the trims, what (as yet unseen) damage has it done to the surrounding paintwork lacquer coating? Repeating myself, I think your very unfortunate experience might make others think twice about getting others to wash their cars. Good luck with getting this sired out. Kind regards, Gareth. p.s. Might be worth adding around the smaller seconhand car sales sites, since these sites often know good car preparation set ups.