I have been using this one and it works really well except it doesn't work for cleaning up my bath making containers or dirty pans (but those really don't need to go in teh wash anyway! )
a dime sized squirt of dish soap (I use teh earth friendly cleaner almond stuff)
1 tsp baking soda and water in your soap holder.
Let me know how it works for you.
I've also heard that 1 Tablespoon of baking soda and 1 Tablespoon of borax work well, but I"ve never tried it