craftgrrl | (no subject)

i'm in desperate help, and i couldnt find any other community, so my apologies if this isn't too crafty, but you are all wise ladies when it comes to fabrics and such.
a while back i bought a "know your mushrooms" nintendo short which i love love love. a few days ago i was frying something and i was splattered with hot oil [nothing happened to me though]. i put some white body powder thing [sorry i cant remember the name, i'm a moron i know] on it but it was a little late i think, and didnt "dry it" on time. i washed it and the spots didnt come off. the shirt is a little faded, so the spots are dark black... i was thinking, is there any way at all to get them out now? as a desperate measure i was thinking of dipping the whole thing in oil to see if it all went dark black.. but i dont know how it may affect the letters? it's 100% cotton, if that helps.

thanks in advance :)