Dishwasher and rotating spray arm thereof

A dishwasher comprising:

• a tub at least partially defining a treating chamber with an access opening;
• a rotating spray arm located within the tub, the rotating spray arm comprising:
• a body including a first side, a second side, a first end, and a second end;
• a fluid distribution manifold formed within the body and having a set of fluid nozzles provided along the body and opening to the treating chamber;
• and
• a chemistry distribution manifold separate from the fluid distribution manifold and being formed within the body, the chemistry distribution manifold having a set of chemistry nozzles provided along the body and opening to the treating chamber;
• wherein the fluid distribution manifold supplies water to the set of fluid nozzles, and the chemistry distribution manifold supplies treating chemistry to the set of chemistry nozzles.