On our ASNU RAM fuel injector cleaner we use mostly 'Dr. Injector' cleaning fluid. But we have pre soaked some really gummed up Ford 4 hole injectors in straight SeaFoam and it works well with the ultrasonic pulsing. You can see the crud boil out.
Retired, US ARMY 1973-1994
ASE mechanic, Electrical 1994-1997
Retired GTE/VERIZON/FRONTIER 1997-2015
Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.
03 Suzuki Burgman 650(Burger King) Scooter
65 Formula S Cuda
78 Little Red Express Truck
98 Buick Regal (wifes car)
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