I have a couple five gallon plastic gas cans that I used to keep diesel fuel in as an emergency back up for when I ran out of heating oil on a weekend. Now I'm in a new house with gas heat and don't need the diesel fuel, but I hate to get rid of the cans (those suckers are expensive!). I've tried every search string I can think of on several search engines, but I can't find out if there's a way (environmentally safe, of course) to clean them out so I can use them for gasoline instead. I couldn't find any answers on THS either. (No, I don't intend to keep them full at all times - I just want to be able to use them.) I even called the local hazardous waste management authority. They said they'd be happy to dispose of the empties for me, but had no clue about how to go about cleaning them out to use for another fuel. I'd basically be using the gas for mowers and other small engines, so I'm afraid that if I just put gas in the cans and started using in in them, it wouldn't be dilute enough for the engines to overcome the mixed fuel and could foul them. (Did that make sense?)

Anyhow, with all the experience in reusing stuff I've seen here over the years, as well as the mechanical experience, I was hoping someone would know if/how I could reuse my diesel cans for gasoline. Any ideas?