Whats is the Clean Up Hook?

I have a script that spawns a couple on SENTs when InitPostEntity is called, the problem is that when a Full Clean Up is ran my SENTs does not respawn, which hook should I use to make them respawn after a Clean UP?

Try adding a 10 second delay(timer) to spawning.

Or that… how come I forget about most of these things ?
Getting a bit rusty when not scripting.

Thanks guys.