Help with Yellowed Mini Marquees

[JuBond]

I recently picked up some mini marquees from a local arcade operator, and was wondering if anyone knows a safe way to clean them to remove the yellowing effect? I tried standard windex, but it really didn't help. I don't want to get too crazy as some of the harsher cleaners might rub the color off of the back. Anyone have a solution?

 

[BigNick]

as far as I know it cant be done. Makes me wonder WTF the guys do with them? I've had a mini in my cab with almost forever... same for local arcade + none have yellow?

 

[candycab]

I dont think there is any way to clean it off since it is a side effect of the marquee actually being baked ,usually by having the wrong type of lights or in a conversion cabinet.

As far as I know the plastic yellows all the way through.

 

[pyrokilla]

mine cleaned off with harsher chemicals...it seemed more like nicotine stains on mine tho (from a smoky bar came the cab)

 

[JuBond]

Thanks for the inputs guys. I'm going to try some nicotine remover to see if that does anything, otherwise I'll just have to live with it.

 

[chris1]

Yea,my Baseball 2020 mini marquee looks yellow.
I tried to clean it with basic cleaners and its still the same.
I'm scared to try and use something stronger I don't want to ruin it.