Redline and Techron are the best choices for an in the tank cleaner. I use them on occasion, but the best way to clean is on the fuel rail. Using a pressurized can of solvent attached to the fuel rail does more than any in the tank cleaner can do. I've used 3M and BWD cleaners and each time they cleane the injectores and knocked so much carbon off the pistons that the computer had to relearn the fuel trim and ran lean for few miles while adjusting to a cleaner combustion chamber! All this in one 15minute treatment. Of course, I only do this once a year since it is harsh. And the can of BWD solution is only 9 bucks! Add the fuel hose and adapters for about $20 and you're good. You reuse the hose forever so you get the best cleaning for the same price as a in tank treatment..,.
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