Filter task calendar by task type

I would love to be able to see only cleaning tasks in the calender in order to see at one glance whether cleaning tasks are assinged or not. If there are two tasks on the same day I always have to click on it, view the task and loose the overview in my head which tasks were assinged and which weren't. I need this because I am using several cleaning personelle across four listings and therefore do not automatically assign cleaning tasks. This feature would make assigning cleaning tasks a lot easier. I consider this feature as essential because without it this nice allocation of tasks is compromised and looses its effinciency.
A simple filter option of which tasks to show in the calendar would do the job. Please implement asap