I am power of attorney for my uncle. We are preparing his house to sell. Can I get paid for cleaning, painting and clearing his house?

Whatever you do make sure if he is a candidate for Medicaid within the next few years that it is well documented with receipts so that it doesn't appear like gifting, which may disqualify him depending on the amount (which each state determines). Labor may be separate from materials, if even allowed.

You can claim back any money you've laid out on materials, fuel, haulage, equipment and so on (you need to show receipts. Don't just make up the numbers). You can't pay yourselves wages, no, because that would still be self-enrichment, even though it's in return for work.

What does the POA document say?

I am Mum's and it says I will be paid $15/hr over minimum wage, which is $30+/hr right now.

My brother is Dad's POA and I am not reimbursed for any of the work I do on Dad's property. My Dad and brother feel my labour is not of any value. So I am not paid for my time, nor my out of pocket expenses, which are currently sitting at $5000.

My brother keeps saying he will help, but never shows up. Dad is a hoarder, there are at least 10 dump truck loads of garbage to be removed from the property and even through I get a deal each one costs $300+.

The reason I put in the work is that the property is in a trust and I will inherit 1/2. It is a valuable property. My bother will get an accounting from me to cover my expenses.

Check the enabling document for specific clauses and wording on what's reimbursable or payable to you as proxy.   There may not be a specific clause, by management of property might be an inclusive category.  This would primarily apply I think to the cost of supplies and your time. 

You also need to consider what other expenses exist, and which ones are ongoing and high priority, specifically the cost of the facility in which he's now in, whether or not he gets Medicaid, etc.

Check with an eldercare attorney but you should be able to get paid. I would suggest you seek a written estimate from another company to show that the fees you charge are in line with the market value of the service. A Personal Care Agreement (sometimes called a family care contract) spells out the duties you will perform and the compensation you’ll be paid for helping your Uncle.