If the tension/jockey wheels on your changer are gummed up then that's not necessarily same job as cleaning the chain.
Suggest you start by removing as much crud as you can with a narrow screwdriver blade (easier if you can turn the chain backwards while doing this. An old toothbrush plus solvent - pretty much anything such as paraffin, white spirit or GT85 etc will do - will finish the job off.
Chains IMHO are best cleaned off the bike; use a chain tool or the 'magic' link if you've got one. Drop chain into a PET pop bottle and add 200ml of white spirit. Leave to soak for 20min then agitate vigorously. Drain off white spirit, retrieve chain and examine. If lightly soiled it's now probably fine to allow to dry and reinstall. If still cruddy clean with toothbrush/solvent and repeat the bottle treatment.
While you've got chain off clean sprockets as well and consider stripping jockey/tension wheels and cleaning bearings etc. This works with older models - some modern Shi*mano stuff may be sealed for life.
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