i saw my shop clean my plugs with a bottle of brake disk cleaner and the oil and burn just came of as if it was water soluble.
i dont know of the side effects yet but it seems to be ok.
its a lot better then a brush and lots of muscle power i belive.
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feel the wind

brake clean is good stuff. I go through it like it's water.
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Charles Gallant

Always have it on the shelf. Can't beat it. Pretty much use a tin for every rebuild.

I use maxima contact brake clean. buy it by the case.

http://www.maximausa.com/products/cleaners/brakecleaner.asp

Like it cause it contains no CFC's and has a nice citrus smell to it.
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Charles Gallant