I usually wrap in plastic wrap/plastic bags and in the winter I leave the wrapped garments on my heat registers overnight (forced air heat). Usually good to wash out the next day, although I sometimes wait longer.
I have begun NOT leaving my stuff out in the sun to batch, as the condensation was falling back onto the dyed items and leaving mottled patterns.

Once I worked out why the blobs were happening, I now nuke them and leave them in any warm place - since I don't turn on the house A/C till it gets up to about 84F in here, the house itself is more than warm enough to get them batched over the course of a day.
