You can wash at 40 or 60, if you have pockets or pul wraps they may stipulate 40. I cold rinse and then put on a wash cycle.
Stuffing wise mf on top (but not touching skin) bamboo then hemp. The silk are liners that can go next to skin and are good for irritated skin. Personally, I ditched the mf and just used bamboo as mf was not absorbant enough, especially for toddler wees.
Enjoy all those fluffy bums again!