How to restore plastic parts.

[Shvegel]

Thought I would pass this on.

[Pawel66]

This is after a month of my fight to make the brake fluid reservoir white again...

[Peter]

"Thought I would pass this on......."


Thanks, I recognize this, brilliant. 

^Peter

[ejboyd5]

Not confusing at all. Shvegel is simply confirming the fact that once the container has changed color it's not going back to white.

[wwheeler]

Plastic is surprising porous and absorbs color from liquids very easily. Once it is absorbed, it is not coming back out. Plastic bottles of swimming pool acid will emit a very slight acidic fume over time. Place a gallon near steel parts and you will see within a few months that the steel will have starting rusting. Highly evaporative solvents will also creep very slowly through plastic bottles. That is why most come is steel containers, not plastic.

[MikeSimon]

Not only liquid, but light will discolor plastic also.

[RobSirg]

Great Post - my experience exactly

[Tyler S]

Not only liquid, but light will discolor plastic also.

Yes. The bromine (fire retardant) in plastics reacts with UV. You can use commercial hair bleaching peroxide cream to change it back to an original whiter color. Though I would only attempt it on cosmetic items as the plastic is already a brittle 50 years old.

[Pawel66]

Tyler, I tried it actually. No effect. Any specific way you could share to make it work? I tried it on brakes fuid reservoir.

[WRe]

https://www.sl113.org/forums/index.php?topic=32030.msg232418#msg232418

[Pawel66]

I did that. It did not work.

You say 10% solution and UV? Maybe I missed UV...

Could you describe how exactly you did that? Apparently I missed something...

[WRe]

Hi Pawel,
Peter from pagodentreff.de put it all together in a lockable glas and left it sometimes turning around for some weeks in the sun.
...Wolfgang

[Pawel66]

I see, thank you.

Do you know if he used just the 10% H2O2 as you buy it in bigger bottle, or he further diluted it?

[GM]

Full strength, undiluted. But you need the "potent" peroxide from a beauty shop, apparently.
I have yet to try this but there is also this - https://www.youtube.com/watch?v=JqCN7VHMtfQ - which I am curious to try

[Pawel66]

Thanks. That is where I got mine. Missed UV maybe...