I had also read that a single member LLC ( with foreign nationals) is disregarded in the US and subject only to personal income tax.

Someone who examine your facts and circumstances and advise you on tax entity structuring and treatment of payments/expenses.If the washing business is a disregarded entity, there would be no deduction as you're just moving money "from one pocket to the other".If an S Corp or C Corp, possibly, but then we'd have to look at: is the payment reasonable, ordinary and necessary. 

I'm not disregarding this idea though, just putting that out there.I was thinking perhaps trying to take this sub-2, inform tenant we won't be renewing lease in March, do the work at that point and list late spring.

I thought the disregarded entity portion did that for me, but just wanted to make sure.

Be careful though because some cities and/or counties don't allow short term rentals or they might but you have to obtain a permit or business license (can be expensive) and people that are doing airbnb in those places and disregard the law or ordinances can be fined.

It appears they have a disregard for your policies. 

As a single member LLC, it would be a tax disregarded entity, creating no more tax burden that you already have.Regarding umbrella policy, I hope that you already have one in place as it is a must, LLC or not.

Please disregard this thread.

Now, the good tenants usually follow up and explain the situation and once they pay, tell them to just disregard the notice, and that it’s just part of the process, nothing personal. 

If the LLC is disregarded and the activity of the property is reported on your tax return then the LLC is not the tax payer for the property - you are.