Allow the shower to heat up, leave steamer out of direct running water. Hang steamer in organza bag provided from shower head. 

Yes, bath crayons come off with just a wet paper towel or wet cloth. You may need to scrub it off a little more, but that is normal. 

Everything is included in each kit that you need to make that product. All kits require adult supervision, and may require a whisk, spatula, a glass bowl, and microwave.