/cgl/ - Cosplay & EGL

Could I get some help with fabric care?
There is a spot on my MM Perfume Bottle JSK that I would like to get out. Does anyone have experience washing/spot treating this garment?
I bought it a few weeks ago on the comm sales, and when quickly looking it over to leave feedback, didn't notice it. However, there's really no way that it could have happened at my house, and now that I look at the proof photo again, it's actually visible. I don't want to bother the seller as I already left feedback/said everything was fine, but I'd like to remove the spot as best as possible so that it won't affect resell value too badly.