If he hires a company to do the work he will have to pay their fees.
If he asks around and finds friends and family to volunteer their time he will need to pay for disposal fees and gasoline and should buy them all pizza and beer.

My friend is getting divorced and his wife is a hoarder. He has now control of his house she has moved out but the mess is beyond any help I can give. Does he have to pay for help or can he get help to clear the whole two stores house?