Use a stiff brish dipped in Scottoil (or spent engine oil and drinch the chain in it. Leave it over night and a lot of the rust will come off with a little gentl pursuasion. My bike has a Scottoiler and I wipe the chain down every week or so, still get the odd spot but very little.
Also worth noting that you should increase the oil flow as the oil os not quite as thin as it is in the summer.
You'll know if your chain is shot if you find it is in need of adjustment frequently. If that is the case after you've cleaned n lubed it I'd change the chain and sprockets.
Good luck
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