engine degreaser is your friend.lol. I used some on my old civic and it did wonders. Spray the crap out of everything, let it sit for about 10 minutes(or what the can says), scrub if u want it really clean after letting it sit and then powerwash. That should take care of alot of the problems.
As for the powerbrace...I took some pointers from FlatBlackIan and made my own. Just make sure you weld some ladder bars on while it is on the car to get the right distance apart and then by some round/square tube from home depot. I payed like 20 for it and welded it myself. It really beats paying 160 plus s&h for a nismo one and it may be more beefy.
Just an idea and good luck with the repairs