have recently bought a new dep chamber as my old 1 was knackered. just wondering what the best thing is to clean it during winter so wont go rusty :)

IMO, after every ride, wash the bike, when the engine has cooled, spray on some WD type maintenance spray, then abrade with a scouring type cloth, don't nick the wife's from under the sink , wipe over, and respray with the oil, job done.
You can also use the same principle for exposed engine parts, and wheels.
Mike

FMTB +1