Soap nuts
Soapods, also known as soapnuts, are the fruit of the Indian soap nut tree and are rich in saponins, which are similar to soap. Put some in a small cloth bag in with your wash they instead of detergents. The suppliers say they are organically produced, can be reused several times, and are biodegradable. Soapnuts (Sapindus mukkrossi) are also available from In a soapnut shell.