raging with myself

[grimmy]

So I am driving to work.this morning and stop to pick up a workmate,so while I am.waiting for him I decide to put water in my window washers.and in my bleary eyed tired state in the pitch black I took the lid off the power steering fluid and topped it up with the washer water.I managed a good half litre in there before I realised my IDIOTIC error.really pissed off with myself.so I ask you lot what is the best way to purge and clean the sysytem out before it fecks everything up.