go to home cheapo (home depot) or another hardware store and look for goo off or bug tarminator they both work really well and dont need any tools or anything. safe on paint just dont leave it on more than 4 min and clean with water.
I put it on there and immediately (using a tooth brush) started brushing it. I did this for a good 10 minutes and the "stain" was still there. I didn't even look today but it may have dried by now. We have some very cold wet weather this week.