Ways to use seafoam. I've done them all without problems what so ever...

-pour some in the gas tank
-spray in TB with a spray bottle with motor on
-spray into the brake booster vacuum line with a spraybottle with motor on
-pour some into crackcase
-pour small amount into cylinders after removing spark plugs and let it "marinate"... motor off of course
-dip brush into seafoam and scrub the inside of your muffler before shows