I've got a few dump tanks (totally not for smuggling an extra 10 gallons into California from Nevada every other week). Last spring I volunteered their use for the lemons team. The problem is that we race diesels and I drive a gasser(boring). It's now winter and time to go back to Tahoe. Is there a way I can/should clean my dump tanks? I wasn't worried about getting trace amounts of gas into the diesel this spring. Should I worry about the opposite this fall? Maybe clean each out with a spritz of gasoline? Ditch the tanks and buy new ones?