[the lodger]

I want to check that the crankcase breather set up on my M900 is clear. There is a canister behind the vertical cylinder. Is it supposed to be removed for cleaning , if so how does it come out ? Out of interest, what is in it ? There is a large breather tube from the canister to a black plastic box just under the top of the frame and just behind the LHS of the petrol tank. Is this box just a void or is there something in it ? I think this setup is standard but would like to understand how it is supposed to work. Many thanks .