How do I remove decal residue

[JaycoRickJoan]

I had one of those static cling decals on the back of my Jayco Eagle trailer. It was on for several years. The decal became discolorded and the transparent edges became brown. It took a razorblade to remove the static cling decal. Once removed the very edge of the cling left a brown residue outline on the trailer where the decal was, that the razerblade cannot remove.
I have tried Goo be Gone grafitti remover with no luck. Any suggestions on how to remove this brown residue from the fiberglass?

[ScottG]

Camper_Jeff_&_Kelli wrote:
I've used Lacquer Thinner with good success. Wear gloves. I follow with a wipe of paint thinner then wash.

I tried that on a spot on my filon siding and it dulled it.
I always try the weakest solvent first.

[Camper_Jeff___K]

I've used Lacquer Thinner with good success. Wear gloves. I follow with a wipe of paint thinner then wash.

[Dick_B]

Goo Gone?

[i5trucker]

Might have to resort to an "eraser wheel", it is a wheel that goes in a drill and it is made of rubber, like a pencil eraser. I use one when I need to remove the vinyl lettering on my semi truck.

[TexasUltra]

I would use WD-40 then the alcohol to remove the oil.

[ScottG]

I would try alcohol or WD40.