Power Steering fluid nightmare - Please help

[Tony Urban]

Hi all,
 
Today my brother-in-law, who likes to work on cars, offered to lend me a
hand.  My windshield washer fluid runs out as fast as it goes in so
there's obviously a big crack/hole somewhere.  He offered to check it
out and see where it was leaking.  No problem, right?
 
Well I get home from work and he says he found the leak and "patched it"
which I figured would be fine until I took it to my mechanic later this
year for an oil change and then I'd have him look at it.  The my bro
says "I also noticed your power steering fluid was low so I topped it
off".  UGH!!!
 
Of course he used some cheap synth power steering fluid from Wal-Mart
and not G002000 and now I'm totally freaking out.  I know this stuff can
ruin my power steering system(among other things)and I'm desperately
seeking help.  
 
I have a 1993 90S Quattro.  The car has not been driven since he added
the wrong fluid.  It hasn't even been started.  It's just been sitting
there.  Is the bad fluid all through my system?  Can I disconnect the
lower hose from reservoir and drain it, then refill it with fresh fluid?
Even better, can I just siphon the fluid out of the reservoir or is it
"in deep"?
 
If someone could please lend me some advice as soon as possible, I would
be extremely grateful.  I don't want to drive the car until I find out
what my options are and my mechanic won't be back in until Monday
morning.  
 
Many thanks, in advance!
 
Tony
tony at crazyralph.com