Twist the cylinder-shaped filter on the bottom of the Frigidaire dishwasher tub counterclockwise and lift it out.
Grab the bottom spray arm in the center and pull straight out to remove.
Hold the spray arm under running water and clean gently with a soft brush.
Use a toothpick to gently remove any stubborn debris caught inside the spray arm jets. Use a cloth dipped in vinegar to clean the spray arm if hard water has caused mineral deposits to build up on the spray arm jets.
Wipe the spray arm with a dry cloth. Reposition the arm in the dishwasher, turning it clockwise and pushing down until it is secure.