It is the home owners responsibility no matter who, what or why the biological material was left. You can pay some one, and companies exist that specialize in just that.
My ex wife's grandfather chose the 12ga exit out of life. Because her grandparents were the only ones in her family that ever treated me with respect and dignity. Out of respect and love for her grandparents , I took it on myself to remove all the biological matter that was deposited over and embedded in ever square inch of an enclosed 10'x20' outdoor patio.
Scrapping the grey matter and blood off the ceiling of someone you respect and love is an experience that I hope never to repeat. I finished all the patching , painting, replaced the carpet and was loading up my tools when the rest of the family arrived. So they never had to see the nightmare left behind.
After working non-stop for 10 hrs to accomplish all that work. When I got home my wife informed me, " I didn't feel like cooking so I ordered a pizza". My appetite instantly disappeared to her amazement. She is not a stupid woman by any means, but to this day
I still wonder WTF were you thinking , knowing all along what I just spent an entire day cleaning up. Things that make you go Humm.
I hope none of you ever have to experience the emotion of scraping someone you love off the walls and ceiling and picking bone fragments out of the drywall. A 12 ga to the head looks like a bomb went off taking the entire head almost completely off. The he things we do for love and respect. SMH