I would use the lucas fuel system treatment. This is the first product that I have seen that actually works. I currently work at autozone and it was the product of the month. Cusotmers came back and bought more because they said this really works.
Seafoam. Out of all the magic potions, I think that this one will resolve any issues involving deposits or water issues... I also think it's the only one not to do any damage since it's petroleum based. Haven't found too much information otherwise, unlike Lucas products.