I want to wash/clean my down filled top quilt. I was planning on using dawn. I use dawn for all my merino wool, it's gentle and leaves the wool very soft. I don't feel like buying special "down soap" unless it's worth it. What do you guys use? Also, anyone feel the need to wash a brand new quilt? I know I don't need to, but I know how it's recommended to wash new clothes before wearing them, which I usually do.