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To remove 'wad plastic' I use a bit of steel wool on an old 12g brush with some Hoppes #9. Spin the rod on a low speed drill for ca 10 sec and it shines ! This would work for dried up oil cra* too. Oil well after.
I recall a note that Ed's Red (a traditional cleaning solution) could be mixed up without the acetone if you weren't cleaning plastic out of shotgun barrels, from which I infer that this is a key ingredient if that's what you do want to do.
Open the action over some cardboard or newspaper and blow a can of brake cleaner down through the action letting all the gunk run down thru. Never saw need to tear down unless really gummed up.