What products are being used on glass windshields without a wiper?
2.  When changing oil filter, I always replaced o-ring on my first Chevy.  I would assume that should be done on these machines as well.

[2015 Z Force 800 53/Trail EPS]

What products are being used on glass windshields without a wiper?
2.  When changing oil filter, I always replaced o-ring on my first Chevy.  I would assume that should be done on these machines as well.

I've changed my oil and filter many times and haven't changed the cover O-ring yet. I do have an extra one or three just in case it ever leaks or if I ever see a flat edge start but so far no need. As for your other question...water and glass cleaner..window squeegee?

What products are being used on glass windshields without a wiper?  snip....

I always use Rain-X on windshields and (in car) driver side windows.  It is so effective in rain and snow that I hardly ever use windshield wipers.

Natch ATV/UTV is slower, but should keep the glass relatively clean.  Simple spray on water will get 95% of junk off, and bugs don't stick as much.  There is warning about Rain-X not to be used on plexiglass/plastic windshields or helmet visor, but I have never had a problem with it, nothing ever turned yellow or clouded up.

Rain-X does wear off, so if you repeatedly rain/snow or wash it, it needs to be re-applied.  I always apply 2 "coats", to make certain all is covered.  Very simple to do, only takes a few minutes.

Oil- no leaks so far, everything OK.  Idiot design of filter cover, had to make a "1/2 jar" sort of funnel to keep oil from dripping onto plastic skid plates, takes forever to drip all the way out.  I noticed that Suz King Quad comes with a standard (similar) half funnel for their oil filter change.  Also, careful, watch the removal of that plastic cover, easy to break the little pin attach part.

YMMV 

Being an auto glass /glazing tech all of my life we used a great glass cleaner called Spray way.You can use it on anything includeing plastics.
It can be found in hardware stores,Wal Mart,places like that.Not only does it clean your glass but it has a great smell.
With things going up all the time i have no idea what the cost is.