Do not shower, swim, or sleep with earrings on.
Polymer clay is quite durable when baked right however there are still chances of them breaking. Depending on the thickness of the clay, the pieces are bendable up to a certain level after which they will snap. Please do not bend the earrings. Please take extra care and treat them as you would any other delicate jewelry. Do not drop the earrings.
Brass earrings can be easily cleaned with Tomato juice or ketchup. Rub ketchup generously on the earrings and let sit for 20 mins before washing off.