How do I use and fill the rinse agent dispenser?
Unscrew the dispenser cap and add liquid rinse agent until it just reaches the bottom of the lip inside the dispenser opening, then replace the cap. The dispenser automatically releases the rinse agent into the final rinse water. Occasionally check to ensure the rinse agent container is at least half full, and if you accidentally spill rinse agent, wipe it up with a damp cloth immediately so it doesn't interfere with detergent performance.
From the official GE GSD570 Stainless Steel Built-In Dishwasher manual, page 6
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