Does anyone have a good recommendation for a floor polish brand that will last well?  

An indicator of the severity of the situation:There are more private security guards in SA than police and armed forces combinedThe number of private security guards in SA (50 million population) is larger than the USA.This being said SA remains a beautiful country which I proudly call home... oh and there are many opportunities for the savy property investor ;-) Johann

I hear there are ways to get around the Sign Police.

There should also be a police report on file showing which unit had the issues, since you are suppose to report the issue to the local authorities. 

The tenant has threatened me before in the past over text messages but has been civil in person.I was going to give notice to enter the unit and schedule a locksmith (to open the storm door) and hopefully change the lock in the storm door so we can both have keys, and schedule a police officer for a civil standby.  

I'd call the police, they'd likely be able to test it to confirm what it was.

Thanks to the local police presence, the campus itself is very safe, but there's definitely a reason the homes in the surrounding area are valued what they are.

Are they doing a a hazardous job to protect their fellow citizens like firefighters, police or military?

The first 4 days of no contact and no police, or national guard protection was also scary.

I’m a police officer in a specialized unit working 50+ hours per week and I also hold my real estate license for the last year and a half.