Paul, first off, i put my boots on at my hunting area.
I do not use my boots for anything else.
I periodicly clean them in warm water and baking soda.
I also use scent eliminators like vanishing hunter,scent sheild etc.
I don't use cover scent directly on my boots, i use a scent pad or scent drag.
I use leather boots, and rubber boots, it depends on the hunting terrain and how far i have to walk that determines which type of boots i wear.
The key in my opinion is do not wear your boots, other than for hunting, you can pick up odors like gasoline etc.
Same goes for your hunting garments, keep them in a scentlok bag or garbage bag with scent wafers of some sort.
Hope this helps.

Brian