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@cozzzzzzzz
genuinely only put one dab per link, let it sit for 15 mins, then wipe off excess with kitchen roll.
cleaned it with fenwick's foaming degreaser. spray on. let sit while I clean the rest of the bike. hose off. then reapplied, and run chain backwards with agitating brush held against the cassette and chain. did this 3/4 times until cassette and chain were silver. individually cleaned jockey wheels with the degreaser and holding each between finger & thumb to get built up gunk off.
think it must just be residual dried up gunk + unseen jockey wheel gunk = black drive train. might be some contamination coming in from the chainrings too. I'll take off the chain and jockey wheels and clean them that way, I think