Originally Posted By: yeti
c3po -- you're right - gary is knowledgeable, and he wouldn't recommend the power foam if it didn't work. years back, we "backyard mechanics" tried a few spray products, with mixed results. that's when one of the boys came up with the "roto-rooter" method, using old type speedo cable in a variable speed drill. excellent results.i'm sure that modern spray cleaners are more effective than the products that were available back then. buy the amsoil power foam, and have at it. good luck, and let us know the results.
I have used the Amsoil power foam to clean the throttle body. the stuff worked great, clinging to the parts that were in need of deep cleaning. made short work of any carbon. I really needed it on the underside where other solvents would just run down. watching the foam slowly slide down the walls and leaving a clean surface made the job a lot easier.