If you've got soft water you can use Ivory soap flakes or another "just plain soap" product that is available in your area. You'll want to use HOT water for your whites or they'll start to get a bit dingy after while, and your washer will appreciate an occasional drink of vinegar to cut the soap deposits.
Hard water and soap don't get along, however, so if you have hard water look for an unfragranced/dye-free laundry product like AllFree or CheerFree.
Or, go ot a feed store and buy a gallon of "Orvis Paste". The stuff is straight sodium laurel sulfate (detergent), no dyes or fragrances. I use a teaspoon in a large load of laundry (two teaspoons for kid clothes that are full of grunge), or about 3 tablespoons per pound of raw fleece.
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