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Yeah, I've done it before and have tried very hard to keep oil out (mainly because I didn't want to do the traditional method anytime soon). Mine should be fairly clean. I doubt I have more than 15k miles since the previous cleaning 2 years ago.
But you are correct, I would not try this if it's never been cleaned before. Even with the oil/air separator in-line from close to day one. It still had a good coating of varnish. I didn't have any caked on deposits though. It only took about 30 minutes and a couple cans of cleaner and it looked new-ish again. Hopefully this Sea-Foam method will be the easy way to maintain that clean.
I'm getting about due for a plug change so no better time to check it.
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