To keep your pieces as fabulous as possible:
Avoid direct contact with perfume, makeup and other beauty products as they may stain.
Avoid swimming in your jewellery.
Polymer-clay and rubber pieces maybe cleaned with a damp cloth if required. For tougher stains, non-painted polymer clay pieces can also be cleaned with small amount of rubbing alcohol or acetone (nail-polish remover) on a soft cloth.
Polymer-clay is somewhat flexible, however it may be damaged if over flexed.
Store out of direct sunlight in a cool, dry place.
If tassels frey you can iron them over so smooth them back out, I find my hair straighter works best!