Can the fee to clean up his home be paid from his estate and HOA insurance and limited home owners insurance policy?

The estate is responsible to clean out his home. It's unlikely any insurance will cover the cost.

What legally can I do to this guy to get my money? We have a contract.

I agree with Andrew. Your breach of contract claim is strong. If you do get a judgment against him there are firms who specialize in collecting it...

It means no one objected to the accounting so the court accepted it without scrutinizing it.

Is this a debt that should be paid?

I agree with Stephen's answer. The expectation of an inheritance would not likely be a basis for an unjust enrichment claim, and since there was...

Can I as the sole beneficiary of my Parents trust change the Executors of my Mother's Will?

As beneficiary, you may not change the executors, unless the will states you as sole beneficiary have the power to remove and replace trustees. ...