How do i stop office chair sound when leaning back?
I've used Lock Ease for this exact issue.

Lock Ease is an amazing product. It's dry graphite, with an alcohol (I think) based carrier fluid packaged in an aerosol can. The carrier fluid help gets the dry graphite to penetrate then evaporates leaving no oily residue behind. It's made for lock cylinders, but I use it wherever dry lubricant (such as graphite) is needed.

Disclaimer: Amazon link for convenience only, I don't work Lock-Ease, Amazon, or the Amazon Marketplace seller distributing the product.