Guys,one thing I don’t quite understand. Everybody is saying to spray the plugs with some type of solvent and let it soak in. That compressible ring on the plugs is a seal,it prevents exhaust gas and compression from leaking by the plug. If it can hold 90-100 psi of compression then how is anything gonna soak by it? Seems like the best way to soak it would be remove the heads and soak from the bottom,the threads themselves are not sealed and solvent would soak by them.