I wash everything that comes in the house. I spend so many hours in design, effort, time and money to have a quilt not play nice after the fact. Frayed, bleeding, wrinkled, washed out and shrinking fabric is not what I want to play with and knowing how a fabric acts before I want to use it is the smart way to be sure of what I am using.
Washing a load of fabric is way too simple a thing not to do. It keeps me happy.
peace