I hate the smell of the stuff, but it will wash out.

Chose your battles, this one doesn't seem like a big deal. 

Planning is half the battle, so you are well on your way!

Nothing pressing about the repairs but it cleans the place up and my tenants are happy their landlord is doing something, as are the neighbors : )  Appreciation smells and spells like speculation to me.  

Unless you have a lot of money your worried about protecting, or a situation like @Marcia Maynard  don't run out and form an LLC thinking it will save you, and you can put any clauses you want in your lease, if someone wants to sue you they can, and if they have a valid reason for suing you, they could win.Get a good umbrella policy, at least $1 million, and manage the property properly,,the insurance will provide your defense if someone does sue you.I always put it this way, if your tenant tells you they smell gas and you do nothing, they tell you again that a few days later, you do nothing, and the house blows up and hurts someone, your in trouble, I don't care if you have an LLC, series LLC, 19 different shell corporations etc,,,you didn't take action to resolve the situation and will be held personally liable (after all you were the one that didn't take action).  

I smell opportunity in starting an REA club in Springfield IL.Elizabeth Colegrove Love the podcasts!

One gentleman I know does it indoors daily, and I only know because I observe it, I can't smell a thing, perhaps because its steam, rather than combustion, based.

My opinion is that half the battle is to place good people in a system that is correctly set up for mutual benefit.

Collecting is always 99% of the battle.

Pick your battles carefully and know thy adversary, especially if it is you!