Since Ive moved into my new house, the landlord insists on me keeping my bike outside. It is secure so its not a problem, however today I went out to the bike, which is under a kind of nylon/polyester cover, and i noticed a distinct orangey tinge on the chain and rear gear mech, definitely the beginning of some rust. Having always kept it in a shed/garage/house before I have never had this problem and assume it must be due to the damp in the air as it has rained a bit the last few days. What can i do or buy to stop it rusting any further??