What is the correct way to use the Zerostat?

Mijo, I apologize if it seems I follow you around here just to contradict you. That is not the case, and in fact I don't disagree with everything you wrote above.  But I do disagree with your bald statement that Zerostats do not work.  They can work, but most of us do not use them correctly OR, more often, we do something AFTER having treated the LP with the zerostat that puts a static charge back on to the LP surface.  There are long threads here (not this one) in which this is discussed in detail by others who have put more thought into it than I. But in the course of my own research on this subject, stimulated by one of the other threads here, I came upon a terrific white paper on static electricity authored by Shure.  Anyone interested in the subject should read it.

Second, I am not sure why you mandate use of a dust cover.  Dust is bad, but a dust cover is worse (than static electricity or dust collecting on the stylus tip) for sonics, when one is actually playing an LP.  In addition to the fact that a dust cover does not prevent the accumulation of a static charge and doesn't even perfectly solve the dust problem, dust covers cause a resonance and mechanical feedback that is very pernicious to SQ, in all my experience. As to the value of a DC for protecting the stylus from dust, there are quick and easy ways to clean the stylus even in between each playing of an LP (like Magic Eraser), if one is so inclined.  Further, taken by itself there is nothing to say about your claim never to have worn out a stylus; it's possibly true if you change styli or cartridges about every 500 hours, but it's not possible if you run one cartridge/stylus for many thousands of hours, dust or no dust. Anyway, my remarks are for a fun debate only; nothing personal.

Discwasher used with D4+ fluid is the best thing before using the ZeroStat. 

Lewm You can contradict me all you want.
Zerostats will kill static VERY temporarily. Like I said before the stylus rubbing the groove puts the charge back on in a hurry attracting dust to the record and there is plenty of dust in the air just look into the beam of a flashlight in a darkened room. The static and incidental dust are the reason you need a grounded sweep arm. It kills the static as it is being made. There is absolutely no downside to using a dust cover. They keep dust off the record and your delicate tonearm and they also decrease the decibels around your cartridge, arm and record. 
If you have a complex table like a Basis or VPI it makes keeping the table clean much easier. I would never use a table without one. The myths perpetrated against dust covers were generated by manufacturers who could not easily attach one to their table or by people who have no idea what they are talking about. When humans have no idea what is going on
they make stuff up. They mythologize.  Zeus throwing lightening bolts is a good example. The mythology surrounding Audio is second to none. I have fallen for it on several occasions. 

It seems you worship a different set of deities. I don’t and didn’t argue that a dust bug doesn’t work to reduce debris in the path of the stylus. And if you like dust covers, that’s fine too, but not for me and most others, when playing music.

Lewm,

The argument was not over the "dust bug" but over whether or not Zerostats work. If the goal is to keep Static and dust off the record they do not, particularly if you do not use a dust cover. If you use the Zerostat and quickly drop the stylus and shut a dust cover you will have less dust on the record during playback but you would have to use the Zerostat immediately on opening the dust cover to keep the dust from flying to it and messing up the next playback. If most people do not use a dust cover it is mainly because their table was not supplied with one not because there is some magic audiophile mythology not too. It is my contention that because the dust cover lowers the volume surrounding the cartridge and tone arm that tables with a properly mounted dust cover sound better. If you have an un suspended table you can not mount the dust cover to the table which is why all mass controlled tables do not have a dust cover. You have to mount the dust cover to whatever the table is sitting on which makes things a bit more tricky. But you can order your cover here  https://stereosquares.com/ and you can get hinges here
https://www.fullcompass.com  and with a little elbow grease, a drill and some cyanoacrylate you can have a really nice hinging dust cover. Put felt pads under the corners so it does not rattle.