Not. Only flannel as it shrinks so bad.

No I dont. If I had to prewash that would take all the joy out of quilting.I want to get quilting right away. I have never had a problem. If I had to worry about germs every time I would be a basket case. My philosophy is that a little germ is good for the immune system.I love to be clean but sometime we can go overboard.

Depends on the look and feel of the fabric if I pre-wash

i think pre washing is a waste of time, unless you would have a color or two that would bleed, such as like anything red, and even black, rinse in cold water with a hand full of table salt, and rinse til the water is clear, if you dry it in the dryer, it will shrink..
good luck,
katz