Getting a mobile home owner to clean up their lot.

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We have a few mobile home lots on a property. Two lots have our own mobile homes. Two are rented to mobile home owners. We must keep these two lot renters as we barely are covering expenses on this property, but they are junking up their yards so much that it causes us to lose prospective tenants in our mobile homes. Does anyone have suggestions how we can motivate these two to keep their lots cleaned up without actually having to evict them? These two are habitually late on rent and almost every month must pay late fees. This is not always a bad thing as the extra income from late fees has helped us, but when combined with the junk in the yards, it is becoming a very difficult situation to know what to do except to evict them.