One of the very best buys at Costco is the 12 pound (!) bag of Arm & Hammer pure baking soda. I think it is the one cleaning staple you cannot be without. You can go to their website www.armhammer.com for great idea on how to use it as a non-toxic cleaner throughout your home. Another great resource is Vicki Lansky's book called "Baking Soda Over 500 Fabulous, Fun and Frugal Uses You've Probably Never Thought Of"