I use Gunk Fuel Injector & Carburetor Cleaner (12 oz.). I found them on Autobarn.com for only $2.79 each so I bought six of them. It contains Polytheramine as the cleaning agent.
Guaranteed To Pass. Ran it though an old Altima with over 100,00 miles couple times, then had to pull the head off for other work and the injectors looked like they were brand new. First hand observation.
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