OLY-JIM
ArboristSite Guru
I don't clean them with any more than a wire brush, if it fires its good, if it fails its trash. I have used a propane torch to clean fuel fowled plugs for the kids dirt bikes at the track. But that is only an "emergency-race-starts-in-5-minutes-technique".
Absolutely 100% re: wire brush!
Sprig; said:Yup, agree with you, a fine wire brush is all you need and make sure all the crud/debris is either blown out with air or washed with a bit o' fuel, check gap and plunk it back in if it looks good. Never have found a use for old ones except ta make your toolbox look fuller.
Once they're shot...they're excellent fishing / trott-line weights. Just ensure that they're well cleaned prior to initial use in order to avoid petroleum by product in the water while fishing...resulting in no bites! Really!