PB Blaster is an anti-rust spray - it works to release the rust in the threads of corroded nuts and bolts... if you can reach under the car before you put it up, spary any connectors you can find: there are three for the ball joint, the bolt through the endlink, and however the control arm attaches to the cross member (I think it's two bolts?) and the rear mount (through the bushing?)... Sometimes it works right away, and sometimes you have to let it sit and work, but I've found it decreases the amount of effort I need to use most of the time, and also decreases the number of bolts I twist off... also, if you're really stuck, heat up the bolt and then spray it... it's a bit stinky, but effective most of the time...

I know that the chain auto parts stores in my area carry it... It's a white can with yellow, black and red... I think it's a yellow top...

I wish it was your passenger side control arm - I have an extra one of those... the yard buggered the driver's side one by torching off the welded bolts... oh well...

Best of luck... ezsha