posted on
July 02, 2009 at 08:58AM
Powder detergent allows for just about anything to be added to the detergent and remain stable as a powder. However, liquid detergents require special ingredients to keep all the ingredients evenly mixed in a homogeneous liquid.
The ingredients that keep the liquid ingredients stable contribute to the detergent being viscous and sticky. This thickening quality makes the detergent much more likely to leave residues behind after each load.
These residues contain enzymes, which will eventually die and become food for bacteria and mildew. The more residue, the more food, the more bacteria/mildew, the more likely your washer will smell...well...not-so-fresh.
Powder detergents dissolve without thickening effects, and without stickiness, so they rinse cleaner from the washtub, reducing the likelihood of mildew.
It doesn't hurt that powders tend to be cheaper per load as well. :)