Awwww shit bro that's easy.
Ask Gilgamesh about the troubles of getting the milk off of the steamer.
( mike woz ere 7442200 & 7696970 getter, Sun 5 Jul 2009, 11:08, archived)

I'll show you a steamer you'll never forget

( Gilgamesh gazed in wonder as Frampton came alive, Sun 5 Jul 2009, 11:11, archived)

cup of hot water
sit the pipe in it for 5 minutes while you clean the rest of the machine
job done.

Milk will strip away the silver finish on most though, leaving you with a copper-coloured pipe.
( spangolin - the odds are good but the goods are odd, Sun 5 Jul 2009, 11:39, archived)

or use a knife if it's gunky and shit.

( spangolin - the odds are good but the goods are odd, Sun 5 Jul 2009, 11:41, archived)