Yeah, Seafoam is great stuff. A few years back my dad asked me if I wanted his old snowblower (10 or 15 years old, 10HP) and I said "No but I can store it in my equipment shed for you if you want". Then last fall out of the blue he asks me if I am still using his snowblower and if he can have it back. I don't know how he managed to not hear me that I wasn't going to use it, but he had given it to me without draining the gas or anything, and it sat in my shed like that for about 3 years. So I drained the gas tank, the fuel lnes and the fuel filter, then topped up the tank with fresh gas and a shot of seafoam. Also changed the spark plug. Took a good few pulls to get it running and it rumbled like a tank for about 5 minutes, but then it smoothened out and after 10 minutes it was purring like a cat. That seafoam had cleaned out every bit of bad gas. The next morning it started cold on the first pull, and when I dropped it at my dad place later that day it cold started on the first pull again.