Hoarder House Cleaning Cost Dallas-Fort Worth

Hey BP,

I have a potential wholesale deal and the house I am looking at is a hoarder house. The client is inheriting the house from their father in law that recently passed. They said he was a hoarder and I was wondering what are the estimated cleaning cost. I haven't been able to view the house yet and know it probably depends on the amount of garbage, but it is an 1500 sq ft SFR in Grand Prairie, TX.

Also, I assume the answer is yes, but should I get the house cleaned before submitting to buyers? The owner asked if they should start cleaning it out, but obviously do not want to deal with this at this time. 

Thanks,

Adam