[Cleanup and map markers of Supply_drop and Crash_spawner]

I've just started messing with Epoch events, and I found a thread with map markers and they seem to be working fine when the supply drop spawn in. But what I'm after is:

 

Map marker that spawn with the supply drop and crash spawn

Cleanup of the two scripts when a new one spawns, beacuse as it is now they spawn and they stay in the game untill server restart.

And with that a removal of the map marker that spawned with it.

 

Is there anyone that could help me with this?

[EpochEvents Supply Drop]

Where in the supply_drop.sqf would I add this code?

[EpochEvents Supply Drop]

What am I supposed to look for in the RPT btw?