Here is something to try:
Get a bottle of rubbing alcohol and a small spray bottle.
Get a tube of dry powdered graphite lubricant.
Add both to the little spray bottle, mix well.
Spray all front control arm bushings well. This mix is cheap, so use liberally!
The alcohol will penetrate tight spots, taking the powdered graphite with it, then the alcohol will evaporate leaving the graphite behind. It takes longer to "Wash away" and should last longer than WD40 or equivelent.
I read this somewhere as a cure for squeeky polyurathane bushings (Which I have). It works for me.
Normally, mine starts getting really noisy after rain. What happens is a thin film of RUST forms between the bushing and the center and transfers (sticks) to the rubber/poly bushing, and the squeek is the result of metal to metal friction (Which is what jastrckl pointed out, only in that case, you no longer have a bushing, just metal to metal contact.) HTH!
