I overcast with a wide narrow zigzag stitch or with a wide narrow serging - the serging stitches are easier to remove than the zigzag one. I just feel that it's worth it for two reasons - 1) minimizes the strings and 2) I don't lose any fabric due to raveling - and in a bad case, that can be over half an inch on each end
As far as fraying goes - in my experience - SOME LQS fabric fray/unravel very badly.
I dry the fabric in the dryer - at a permanent press setting - don't overload it - and if necessary take the fabrics out and unwad them (for long lengths) - if it's "good" fabric, it usually dries relatively wrinkle free and I just "hand press" it while folding it.
If a dryer isn't available, I'll line dry. Usually turns out nicer for me when dried in a dryer. Fewer wrinkles.
Basically, I treat fabric like I would treat a garment made of the same fabric.
(Well, not exactly - I do soak the fabrics in hot water now before washing them)
Not that big of a deal.
I make things that I know will need to be washed - so I try to do "preventive maintenance" ahead of time.
My fears are bleach, burns, and tears.
See - already almost as many opinions as posters! ? ! ?