How bad is it? If it’s just a year or so old, it will still run ok in a lot of smaller engines like lawnmowers and snowblowers. I’ve never found anyone that will take it, at least not in my community. If you have a small amount you can pour it into a wide flat pan and let it evaporate. I don’t know what to do with larger amounts. If you find out let me know because I have about 40 gallons in my boat I need to get rid of.