Cleaning yellowed bumper plastics?

[Bandit Boy]

Another question on top of my other questions..... Sorry!

Bumper plastics? Bought some new bumper caps for 60's EM but they now make the original look yellow, can any of you guys pass on a bit of info on how to clean/whiten then up?

As always, thx...

BB

 

[Wiredworm]

You need this: https://en.wikipedia.org/wiki/Retr0bright

Or you can do it yourself using some Oxy Action and Peroxide. I just soaked my plastics in a solution of Oxy Action for an hour or two and then put them in a plastic bag with some peroxide. Stuck them outside in the sun for a few hours and they came up nice and white.

I'm told the oxy bit might not actually be necessary.

I covered the process in my Shop Log here.

 

[Bandit Boy]

You need this: https://en.wikipedia.org/wiki/Retr0bright

Or you can do it yourself using some Oxy Action and Peroxide. I just soaked my plastics in a solution of Oxy Action for an hour or two and then put them in a plastic bag with some peroxide. Stuck them outside in the sun for a few hours and they came up nice and white.

I'm told the oxy bit might not actually be necessary.

I covered the process in my Shop Log here.

Thx for the reply.
Will this process be ok with the inked patterns on the bumpers?