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I hold a rag, tight, against the rollers within the chain coming off the rear derailleur whilst turning pedals backwards, with the intention of getting the gunky wax out.
When I re-apply the lube or start afresh on a new chain I drip it onto each roller and use a specific rag against the underside to get the rollers to drag the wax inside. I probably re-apply every ~120mi and fully degrease every 500mi.
Cheers. So like really hold a rag tight to it when wiping off the excess? Any rag contact with the inside of the chain?