Yeah, Seafoam is proof that marketing works; snake-oil from gypsies, selling ice-cubes to Eskimos! It's similar to the '80s marketing campaign for STP Oil Treatment. Ended up costing Granatelli millions and millions in class-action lawsuits... We'll see another for Seafoam soon enough.
On other hand, fuel-system cleaners with high dose of PEA really does good job of removing dried-petrol varnish. Use some of following:
- Red Line SI-1
- Techron Concentrate Plus
- Gumout All-in-One
- 3M Max Strength Fuel System Cleaner #08814
- Royal Purple Max Atomizer 18000
But if varnish is too thick or too hard from sitting around, even these won't be able to clear clogged fuel-circuits or jets. Complete disassembly and mechanical scrubbing by machines is only way.
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