At my workplace there is a set of cleaning chores which are assigned to certain shifts and positions. The various individuals on a shift and at a certain position are responsible for the assigned chores. The employee is to sign off on having done them, the supervisor is to countersign. One of the chores is cleaning the floor and walls around the soft serve frozen yogurt machine. I have noticed it probably has not been done in months. I'm never on the shift assigned to it but I do have shifts with open time where I could take it upon myself to do it. Being it is assigned elsewhere am I justified in saying, "Oh well, this is not my responsibility."?
Note - The yogurt machine is enclosed by a counter. The nasty state of the floor and wall is not immediately noticeable.