Have a separate hamper for any unmentionables you want washed by hand. Wash everything else on cold, and the colors usually won’t run plus you’ll save energy. Most laundry detergent already has some kind of booster in it to get out stains and brighten colors. Boom, done.
I just assumed that since they’ve been friends since childhood there would have been some sleepovers, even if they weren’t shown. At the very least she’s visited enough that she should feel more comfortable using the freakin’ bathroom for #1.
Maybe they have Beyond People in heaven.