Tempest Fine Wire Spark Plug Cleaning
I pulled my Tempest fine wire plugs as part of my oil change. I notice that some have a buildup of carbon on them. Is soaking the plugs in MEK to loosen up the crud, then using an old toothbrush to brush it away an acceptable practice? I don't think the bristles on an old toothbrush will hurt the plug tip and electrodes, but I'm wondering if MEK will damage the plug.
Thoughts on this?