A few years ago, after driving through a semi-flooded street, my car started to have squeaks. I assumed it was the RSB and re-lubed it. Whenever I re-lubed it, the sound would go away for a while, so I assumed that it was the cause. However, the squeak would eventually come back (sooner and sooner each time). I tried replacing the bushings two or three times with different sizes, material, etc.
Last year I read an article by Marcus @ Heel Toe about strut/shock noise being a normal thing (or something like that). So I thought to myself, maybe the squeaks weren't coming from my rsb and were actually from my tein coilover. Perhaps jacking the car up and the coilover being unloaded would make the noise go away.
I then jacked up my car, sprayed the coilover's strut liberally with lithium grease, and put my car on the ground. I have not heard a squeak since then, which is relief...since I used to jack up my car every 2 months or so.