Capt same sort of idea i do with the degreaser and tooth brush. Normally i find if you have cold pipes (ie havent run the engine for a while) if you spray it on and allow it to get in and penetrate the grease then even sometimes you can just wipe it off with a cloth.

I normally cant wait this long and just spray a load on and go like the clappers with the toothbrush. Never had any problems with mine.

Ive heard alot of people using that brillo type stuff but i would never us it on my pipes, used it once for cleaning out a pot and pan set after my Duke of Ed in the mountains and near scratched it all away it was that rough at the end. Took about 5 washs with water get get the rest of the dirt away.

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Plough on