As a general rule, your earrings should be the last thing you put on, and the first thing you take off.
Please avoid excessive exposure to water while wearing and storing your earrings, and keep them away from perfumes, lotions, and oils. If you do get some lotion or makeup on your earrings, you can use rubbing alcohol and a cloth to remove it.
I recommend storing your earrings in a cool, dry place and away from things that could cause scratches or abrasions. Polymer clay is durable, but not indestructible. Please treat your earrings with care.