You are right:http://www.monarchparasites.org
Click on Rearing Monarchs
Tip # 1: Sterilize all materials that contacted larval and adult monarchs, including rearing containers, flight cages, and countertops, with 20% bleach solution. Soak plastic ware and fabric for a minimum of 4 hrs in a basin filled with bleach solution, and allow to soak overnight if possible. Bleach surfaces that contacted monarchs several times daily.