Cleaning up callouts

I don't know about everyone else but one of the biggest problems in my server is getting people to clean up there scenes (Peds, Vehicles etc) asking some people to clean up there scenes is like your asking for a kidney. My suggestion is to either make it so anything spawned by a callout or the player will be automatically deleted once they code 4 the callout or get far enough away from it. if thats not possible then maybe add the option to automatically clear the world of vehicles, peds etc spawned by FivePD every 3-4 hours or so.

I just want a way to keep the server clear of vehicles, dead peds etc from sitting in the middle of the road.