That is nothing, I maintain a friend cycle that lives outside on the street 1/4 mile from the sea Se front in Brighton.
When gave it the once over for the first time the chain was not worn but i threw it away because i trouble removing from the bike because of the corrosion.
Each year when i maintain it i automatically replace the chain and cables due to corrosion even though it they are not worn.
It is not possible to take it in doors