Tenant moved out, terrible smell of old wet dogs in the entire house. 

Moreover, if the house smells of too many synthetic fragrances, like candles, air fresheners, or sprays, it may be to cover up problematic odours.Check for leaks under the sinks, basement, windows, and other areas if you notice a moldy odour.

What’s permissible for me may be impermissible for you, so check with your local council/governing body to determine what work (if any) requires permits! 

(I've also seen the effect high-voltage can have on the human body... that isn't pretty either)I think I'd have an easier time trying to remember how many houses with old, ungrounded wiring we HAVEN'T rewired.

I've seen the most horrible looking, smelling, condition properties get flipped.

Therefore, you have to be able to tolerate the smell of animal urine occasionally. :)

However, he doesn't have an entreprenuerial bone in his body.  

Napoleon Hill is great but I am surprised no body has mentioned "The Game of Life" by Florence Scovel Shinn.

My body can do it, but my lungs cannot.

In fact, minim formaldehyde release can�t do harm to people�s body.