If I found 200,000 orcs at my front door, I would...
call Orkin Pest Control:
http://www.orkin.com/
Having Orcs on the premises is embarrassing (I mean, really, what would the neighbors say?), and Orc defecation is unsightly and unhealthy! So have your home sprayed biannually to eradicate those pesky Orc infestations.