Clean or dye old plastic- non 356 related

Don't use sandpaper on soft plastic.  You'll just make it rough and more prone to soil.  You may have to live with the "patina" or without the cool texture/lettering.

There is stuff to restore the black trim on the outside of cars.  That may work.

SEM makes a color coater paint especially for plastics and vinyls. Google SEM paint products. Great stuff!

I would give it a good rub down with silicone and embrace the patina.

You can use SEM products for that.

You will need their Plastic Prep
https://amzn.to/3mu3bUv
and Classic Color Coat
https://amzn.to/3FbEiDF

Spray on the plastic prep and while it is still wet mist over the Color Coat.  Finish with a couple coats and it will look new.

-=theron

As an alternative to Theron’s product recommendation (I am not familiar with either of those products), you could also try a kit for restoring clear plastic headlights, like this:

https://www.amazon.com/Mothers...enewal/dp/B00GZLMEPM

The washer bag is probably color-impregnated vinyl and it doesn’t look like it has anything silk-screened on it, so if you’re dealing with an aged stain, maybe the very mild abrasive in the Mother’s kit is just enough to remove the stain without petrifying the remaining vinyl beneath.

DO NOT use a petroleum product on vinyl.  That will affect the vinyl and it becomes hard and brittle.

@ Marty Grzynkowicz

I also recommend SEM : I 've down a color change on a pickup truck interior and also  a  speedster interior ( seats,  door cards & dash. It's very durable.

Any oil based product is going to soften and or degrade a plastic but they could be used to lightly clean it.  I have tried to use toluene and others on a corner to test before doing stuff on my old BMW bike plastic and have had some success but carefully and lightly.  

The sem is what IM used on your IM Marty might be the thing to do.

@IaM-Ray posted:

Any oil based product is going to soften and or degrade a plastic but they could be used to lightly clean it.  I have tried to use toluene and others on a corner to test before doing stuff on my old BMW bike plastic and have had some success but carefully and lightly.  

The sem is what IM used on your IM Marty might be the thing to do.

What did they use it on?

Toluene is some nasty stuff,,,its not paint t hinner on the harmful side,,can be used to add octane to gas..

How about W-D40?

EDIT.....never mind I just read the don't use petroleum part.

@barncobob posted:

Toluene is some nasty stuff,,,its not paint t hinner on the harmful side,,can be used to add octane to gas..

If you ever have to remove stuff or stains you start going down a deep dive and the golden rule is like dissolves like so be careful and test on a hidden spot.  

@Marty Grzynkowicz posted:

What did they use it on?

all the button the handles buttons and speaker grills.

Marty, have you tried a Mister Clean sponge to get the dirt/stains out?

I hang out with the Queen of clean (Dianne) and I know stuff.

Yeah, those Magic Eraser sponges are pretty awesome(from my wife Michelle, who I learn a lot from).