I used to use Seafoam (several years) until it became popular and the company got greedy! Price jumped almost 50% in one shot! I switched to Chemtool B12 and use it about every 6 months, as maintenance. I use one can divided over three tanks. My carb.s have never been rebuilt and now have 256K on them.
Wow! Winner! If it wasn't 3:30am, I'd go buy some right now! Thanks.