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Sooty and oily ....OK, so here are the very sooty BP6ES plugs. All equally awful, no special standout cases.
View attachment 343227
I shall pop some BP5ES's in (hotter plugs I think). I hope they don't do any damage, and it might burn off the carbon.
Hold them in a pair of pliers over an open flame, gas cooker hob if the missus isn't looking, see if it cleans them up a bit ...
