I have some light grey plastic panels in my truck that have this yellowing where its exposed to sunlight,that I would like to safely remove without destroying the graining. This seems like it may work but would like input from others.
Sorry for being so vauge. You posted looking for info so I probably should have shared my experience.
The product I posted above is hair developer used for lightening hair & to aid with dying hair... or something like that, I really have no idea. 40 is the strength, more hydrogen peroxide I assume. They come in 10-30 also, get the 40 since it's the strongest. I've heard there is 50 volume & higher but I could not find any. The 4oz bottle I got was the smallest, they come in bigger bottles.
Consistency is like hand lotion. The thicker the creme the better so it stays on the part. You don't want the creme to dry out while exposed to the sun. So I put my part in a zip lock bag. If your part is big, wrapping in saran wrap should work. Works best in direct sunlight. Here in SoCal it gets hot & I was trying to do it around summer time. So the sun was too hot & dried it out quick. I almost resorted to buying a UV light but didn't want to spend the money on one. I ended up putting it on a window sill but had to do it a number of times (multiple days) since that window only gets sun in the mornings.
This trick is for plastics but it doesn't work on all types of plastics so you'll just have to try it if you decide to give this a shot. I was trying to do it on a fiberglass like material, Mitutoyo calipers. It actually worked but not nearly as good as it does with plastic & didn't completely get all the yellowing out.
My pics don't show it that well but here you can see the yellowing (in front of the 0 & after the 50) & the original area that is not yellowed from where the read head sat most of the time.
And here it is after. I know you probably can't really tell the difference before & after but these are the only pics I have, I sold that caliper.
This reminds me, I still need to do one more of my timers.
