The only real injector cleaner that I've seen work is 3M. $20 a can. It will not fix leaky injectors, but does help with old dirty systems. It's not the fake throw in your gas tank stuff. You actually run the engine at idle straight off the bottle and use that as your fuel. Clamp off the return and pull off the feed and the fuel pump fuse. It does wonders for old systems but will not fix bad injectors. I used this on customer cars on a daily basis and on my own rotaries.