I use powder, and only need 2tablespoons per wash usually.
1 bar grated fels naptha, Dr bronners, ivory, etc.
1cup washing soda
1 cup borax
Sometimes a dozen or so drops
Of essential oil like lavender, tea tree, sweet Orange...
I use my food processor to grate and then run the soap through the chopper too, making it really fine. We also use this on our cloth diapers without problems.
Mommy to Anna (12-20-11, Alex (12-1-09) and Jordan (03-20-08) [/COLOR]
RN and custom seamstress and artist on the side