My oldest wanted to mix colours, so one of her batches was 2 packages Orange with 3 of Strawberry-Kiwi (I think one Orange would have been plenty, as you can hardly tell there was anything but Orange involved), and the other batch was 3 Lemon-Lime with 3 Blue Raspberry Lemonade.
My younger daughter was left with a batch of Strawberry (3 pkg), and a mix of 2 Grape and 1 Cherry. She enjoyed stirring the first batch, but by the second batch, my oldest had found the stash of stickers, so they went off to decorate the calendar.
When I washed them after, I simply followed the usual superwash instructions and let the machine agitate, however gently. While the yarn came out just fine in most ways, it is now a tangled mess, so next time, I'll just let it soak instead. Now I have some brightly-coloured fruity-smelling yarn to untangle, so between that and 2nd birthday preparations, I should be rather busy for the next while.