How much would you charge a boarder who moved but didnt clean the?
Asking a boarder to do something does not obligate them to do it. If it was in their boarding contract that they would clean the pasture regularly, then you could try billing them for the labor required to get it done (have someone do it or do it yourself, bill by the hour). But in my experience, you will not get a penny, and its not worth even small claims.