I have a sure way to remove it dude..
I once wore this polyester RP55 shirt.. i got this yellow nasty gum on my back.. and it was the soft hubba bubba shit, so it wouldn't harden in the freezer. So I went on the net, and looked up a few things... one site said that any mineral oil will dissolve the gum.
So what I did is I soaked the stained part of the shirt in a glass of vegetable oil.. now i know waht you're thinkging - oil stains. BUT.. here's what I did.. after it soaked there for a few hours, I took it out, used a knife and a hard brush to scrape it off. The gum came out completely. Then I soaked the shirt in a baby bath filled with 1/4 of a liquid tide cup (after putting some stain remover). The next morning, after soaking it overnight, I handrubbed the shirt a bit, rinsed it - and tada no oil stains, no gum stains.
Basically, the oil isn't a problem as long as it is soaked in a concentrated detergent solution.
Good luck.