I'm going to revive an old topic...I received a yellow wedge last year in a mystery box and have yet to use it. I am finding myself doing more rinseless washes as things are getting cold in the north. Has anyone tried the wedge with rinseless washes, I've been using several MF towels folded into 4's and moving to a new towel after the 4th side is used never putting a used towel back in the wash media.