How to clean up after hamster death?
HOT water usually works well on everything you mentioned. Usually just hot tap water is okay but you could also use boiling water. If you're sterilizing plastic, hot tap water and soap.
The First Dragon
Put a tablespoon of bleach in a gallon of water and use it to rinse everything. The bleach will evaporate when the stuff dries. Keep the mixture off your clothes! Actually, soap and water is adequate for most purposes. The stuff made of grass may not be worth cleaning; but if you could put them in the sun for a day or so.