My polybushes were making horrible groaninig noises, and they were not becoming quieter with time. I looked at specialised greases for polybushes on ebay, but I'm pretty sure they are just repackaged silicone jelly or white lithium grease.
I used normal bearing grease (Motul TechGrease 300), stuffed the bushes with it manually. The sequeaking disappeared, and suspension became much softer and more responsive, now that there's no binding. I did that about a month ago, so I cannot comment on long term effects.
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