Hoarder`s house clean-out issues

[Mikhail Petrenko]

Good evening everyone!

We are trying to buy an old craftsman (2000 SF, 4b/2 ba, 2 stories) from an out-of-state heir. No inside access, but it was described as "a hoarding".

I spoke with one neighbor who has been inside, she told me there were

• intense odors, 
• overwhelming stockpiles of clutter, 
• animal feces, 
• bugs, 
• even rats. 

What are typical budgets to clean-out such a level of hoarding? Are there any solutions to kill odors/smell ASAP? What typical problems should we expect (rotten subfloors etc.)?

Thank you