Got called in to consult on a stored classic that refuses to start, and it looks to me like there's about 8 gallons of very stale gasoline in the system. (Likely several years old.) Two questions: Are there any chemicals that can be used to rejuvenate this bad load of petrol? If I do end up draining it all out (my choice, I think), how does one dispose of nearly two jerry-cans of geriatric gas?