Seafoam is a pure petroleum product. You put 1/3rd of the can into your gas tank, 1/3rd into your crankcase with the oil, and 1/3rd you slowly aspirate into the intake manifold as its running. This causes a LOT of smoke and is recommended to do at night. You should change your oil sorta soon after.

Here's the link to the DIY. It basically says the same thing. https://www.hondacivicforum.com/foru...ad.php?t=14612

 

pull vacum hose off fuel pressure regulator and pour some seafoam in a small cup and while motor is running dip vacum hose into cup and let it suck it out of the cup.