Flushing Out Powersteering System, Brake Fluid

[brandysnaps117]

hey guys. on my series 2 25det which has a 20detpump on it, lastnight my mate poured brake fluid dot4 into my powersteering resevoir, he put in about half a glass or so in there..?
i was pretty sure that wasnt okay and has been told today that its definitely a no go? i disconnected the hoses from the p.s reservoir today and drained the reservoir. how do i flush out the rest of the powersteering system? hoses/pump etc.. i dont have any p.s fluid or anything and also we havent started the car while the dot4 fluid has been in either, will my pump still be okay? but yes please help obviously im not no mechanic so bare with me, thanks alot.

[75coupe]

And a slap for yourself for making two threads for the one question