If I prewash my fabric and keep the cats out of the sewing room (we have new curious cats who don't understand boundaries too well) then I will toss the finished quilt in the dryer with a large damp towel. The towel picks up all the lose threads and helps refresh the quilt.
If I don't prewash the fabric, I wash the quilt.
Since I check my seams along the way, I am not worried about seams coming undone.