I should perhaps add that for soaking purposes, I am recommending soaking in a top-loading washer without ever letting it agitate. It's a convenient way to soak a quilt for a long period of time -- a day or two. Just turn the machine off after the water fills and let it sit. When ready to take out, advance switch to spin, allow rinse water to come in, again stop machine to skip agitation cycle and advance to spin cycle. Two rinses is good.
Agree that agitating a quilt in a top-loading washer is not a good idea. However, spin cycles. When soaking, just hand agitate once in awhile by pushing down on the quilt in the tub. Do the same for the rinses.