I would suggest something to the fat like " Upon purchase, buyer assumes all responsibility of property and ....

If its the original 4 to 6" red clay pipe its very likely you have root intrusion every 4 linear feet at the joint.Yes you may have collapsed pipe or fittings.If you lucky you may only need what is called a "point repair".If you got original clay pipe its time to think about  replacing it with black ABS plastic pipe,cast iron or PE polyurethane trenchless pipe.Youll see a world of difference and no more phone calls from angry tenants.The plumber will use a pipe camera with a built in transmitter to see and locate the exact problem area,then they dig things up,cut out minimum concrete remove and replace bad pipe and fittings ,replace and finish concrete ,test and inspect again with video camera.How much work is needed is anyones guess especially in an older property.If you are on a septic your drainlines MUST be in perfect order ,,,if you are on city sewer,,not so much.On the grease issue there is a great product called Bio Clean which is a grain based enzyme which works great but you must use it once a week ongoing.Of course if you get the cooperation of your tenant to isolate any grease or fat and put in a plastic bag freeze it and throw it  in the trash you are miles ahead.Tell them if they do that they wont have any more of this kind of inconvenience.You can only get Bio Clean from a licensed plumber.Hope this helps and let me know your outcome.Dave DoyleLos Angeles

Now our goal is to refinance those properties before the end of the year so my banker can get a big fat bonus and I can get out of high interest.   

Again barriers to entry are steep but finding tenants and getting a nice fat rent check is very possible. 

Doing it the other way, I can get fat returns and acquire 20 properties in the same time frame while still having tons of liquid cash  available.

My fat fingers do more harm than good on this galaxy S5......damn!

They are telling you upfront they are going to be one of the worse tenants you will ever experience.Tell them a big fat "NOOOO",... and pray they get mad and don't sign your lease.

With respect to item #1 don't just focus on the expense side and trimming the fat; focus on ways to increase your income. 

Let me put this into perspective for you…Imagine standing in front of 1000 people that haven't eaten in 41 days, while holding up a juicy BLT chicken and tuna sandwich dripping in bacon fat, and say: “Who wants one?”.

@Greg Gangle it’s safer in my opinion to take your cash and stack it so you have an extra fat reserve account, ie if you pay extra on the mortgage you have to refi, sell or put a Heloc on it to access that equity in the form of real money.