Clean:  I own a shark steam cleaner and carpet companies own better ones.  

If it's only the carpet, go rent a steam cleaner.

If you did make arrangements  and could not pay the rent until Monday or whatever, you became the maintenance person, the house cleaner, the waiter, etc... and that was the late fee.   

Every time I see a new business ad whether on the road or online like flooring, home cleaners, etc I check out reviews and add it to a list.

In my former career, I interviewed many highly educated people  - doctors, attorneys, judges, engineers, etc who were taken to the cleaners by scam artists - yet they refused to believe that the "investment" wouldn't pay off - they couldn't bring themselves to believe that they just flushed a fortune down the toilet - The fees associated with the "Mastery" program or any other GURU course is nothing more than flushing money down the drain - All of the information provided is readily available for free in many formats - what the student "investors" are paying for is someone to hold their hand while they jump in the pool - someone to make them feel like they have an edge that then gives them the confidence  to take that scary first step - to answer your question .... definitely Fortune Takers

I have thought about using a small amount of liquid sewer or drain cleaner periodically, but I don't want to do any damage to the not new cast iron pipes.

Does anyone have experience finding a cleaner for just one room?

For STR's, your cleaner can make or break your business.

I can only hope that the mastery program helps some of these folks, because I'm confident that most will be taken to the cleaners and left dangling in the wind.  

bro be you and dont worry about the car you drive..the dress code because sum tenants are real smart..they can tell if its a front you putting on...besides the cleaner you look ....the more money will be put in your pockets...drive that g37 until you decide to sell it...