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