Insurance has offered only to clean the clothing.My wife has serious health issues, particularly her compromised immune system,    and all but the most mild cleaners tend cause an allergic reaction.  

I would think Sept 1st would be your best bet but it wouldn't hurt to check at a local real estate office to ask when it is best to rent.It sounds like you want to clean the place up before renting but with people signing leases from Sept 1st to Aug 31st, I've seen cleaners come in after the move in date.

I actually just bought an electric drain cleaner this morning which worked quite nicely and should save me some big hassel and money down the road.

I have seen friends taken to the cleaners by contractors, and I have had customers (in auto repair) pull stuff that would be considered fraud: you just get caught thinking people are honest.I think the side of the coin you have to protect is the one that you are on.

To my surprise the seller left the refrigerator, washing machine, Hoover vacuum cleaner, a jar of pennies probably $25 a plant on the fireplace with a card addressed to the new owner wishing me much happiness in the new home.

Clorox toilet bowl cleaner with bleach.I just spent last week doing this in a kitchen and hallway.

Sunshine Cleaners had to come out and everything.

Scrub any cockroached surface with the harshest cleaner appropriate for that surface.

The responses confirm what I was thinking- wire brush it with 409 cleaner and hope it looks good after. 

If you just went over the wall and painted thinking the smell would go away that was a big mistake.I have had to actually before spray down walls with a cleaner to get the film off the sheetrock.