What kind of detergent do you use to wash your athletic apparel?

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I use a laundry ball kit from H2O At Home:

http://www.myh2oathome.com/angelique

Description from the website:

Thanks to the friction of its ceramic pearls during the washing cycle, the laundry ball reinforces the cleansing properties of water and softens textile fibers to make impurities easier to remove. It protects the laundry against oxidation, preserves its colors and guarantees its softness. Placed in the washing machine for each wash, this ball will considerably reduce your consumption of detergent: 1/3 of the usual quantity of detergent is enough for an impeccable wash.
The laundry ball can also be used alone, for “everyday” washing (not very dirty), or for people with allergies or sensitive skin.

Then I pair it with the 100 natural (yummy smelling! ) lavendar soap they sell. You only need about a spoonful if you use soap at all! The ball is enough for lightly soiled though!