Any ideas folks how to remove this white residue from these caps. Same issue on MK5 Golf. Picture don't show it well. Sorry.

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Edited 24 August, 201411 yr by gav_is_con

Yes I have a solution, buy my lovely brand new set of OE VW ones 

which are yours for the bargain price of £10 plus postage.

 

Ooh. Wish my VW ones looked like those.

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For £10 they can :p assuming the nuts are 17mm.   

The little hand grenade pin thing is for pulling them out as they sit flush

with the wheel face.  PM me if you want them  

Grr is on a hard sale here :P

My daughters Ibiza had this problem..they are damaged by very aggressive wheel acid, used to clean up neglected alloys prior to sale at dealerships
My solution was to get JCT to replace them as part of the deal clincher
There is nothing on the market that will renovate them once they have been damaged by acid
So....buy some new ones......grr66 has offered some VW ones that will fit

I had some going spare in the garage...

Not enough for a full car though - as I bought a full pack and used some to replace lost ones on my old Passat 4motion.

If I can find them, you can have them....