After it is done doing it's enzymatic job, the smell disappears. 

The one I was involved with in the past eventually disappeared, just like hundreds of others doing the same thing. 

For them, it was painful. 

This guy has got to be one SMOOTH LOVER to disappear 93% of your investment and have you worried about his reputation. 

And that's what they will do, keep kicking the can, avoid painful realities, inflate inflate inflate.

Realize that the eviction process can be painful but it is also likely that the tenant when they receive the notice to quit will find a solution. 

That's a pain but can be done, though you'll have complaints in Spring and Fall about it being too cold or too hot.

See what their pain points are. 

As an investor, you should only make numbers-based purchases.Also, agents are only transaction-based - if they make a mistake (or choose to take advantage of your naivete) they still get their commission check and can disappear:(So, a great PMC is often the best choice to start with, since they obviously know the rental market and they have to deal with whatever they help you buy, on a daily basis after the purchase!

I would recommend finding a large developer to learn from or partner with so you avoid a lot of the painful early lessons.