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  • Restoring washer bottle cap

    The original E36/Z3 white washer bottle cap 61661379054 is NLA from BMW and most have yellowed over the years so question is has anyone found a way of restoring a yellow cap back to white?

    Last edited by Dave P; 13-11-2019, 04:21 PM.

  • #2
    Have a google for retrobright Dave it works wonders on yellowed plastics!

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    • #3
      Originally posted by cubz View Post
      Have a google for retrobright Dave it works wonders on yellowed plastics!

      Yes I got the same result from google search but cant see a UK seller so far.

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      • #4
        https://www.chemistdirect.co.uk/bblo...id_36798309331

        ^ This is supposedly a good alternative if you don't fancy mixing up some retrobrite yourself

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        • #5
          If you do use this method don't forget to wrap the cap in cling film once applied to stop the solution drying out

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          • #6
            Originally posted by cubz View Post
            https://www.chemistdirect.co.uk/bblo...id_36798309331

            ^ This is supposedly a good alternative if you don't fancy mixing up some retrobrite yourself
            Originally posted by cubz View Post
            If you do use this method don't forget to wrap the cap in cling film once applied to stop the solution drying out

            Yes saw that method also and ordered some of the hair product off ebay, will update with results.

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            • #7
              I used a similar solution to get rid of yellowing on a washer fluid bottle and it came up great!

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              • #8
                First attempt, cap on right put in diluted household bleach for 3 days - whiter but still yellow


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                • #9
                  2nd attempt with hair products normally found on the z3 roadster forums will post up results

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                  • #10
                    Hell, it'll be perm solution next mate ;)
                    Not actually in the least bit fat

                    2000 S50 Titanium Silver / Black
                    ACS Suspension, Exhaust & Type III Wheels
                    Simota carbon air intake | Strong Strut Front Brace

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                    • #11
                      Originally posted by Fat Tony View Post
                      Hell, it'll be perm solution next mate ;)
                      Brilliant

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                      • #12
                        Update,

                        Hair product didn't have much effect

                        left original, centre bleached, right ebay purchase just cleaned

                        I will try the bleach method again when the weather is better as it says UV light helps the process

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                        • #13
                          #downindaveslab
                          Not actually in the least bit fat

                          2000 S50 Titanium Silver / Black
                          ACS Suspension, Exhaust & Type III Wheels
                          Simota carbon air intake | Strong Strut Front Brace

                          Comment


                          • #14
                            I tried this with my brake fluid reservoir (also NLA) which get quite yellow on the S50 due to lack of heat shield on the exhaust side of the engine bay. Bagged it up in peroxide but it didn't really do anything as the yellowing is all the way through. I think it makes it brittle too.

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                            • #15
                              I was looking through a Facebook page and found that a cap from a Merc fits but not plain like oem unfortunately.

                              https://rover.ebay.com/rover/0/0/0?m...2F202146582669

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