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The blue know is used during the rinse cycle. A stream of water comes out of it instead of just the main water pouring down.
Sorry, there was a problem. Please try again later.I am not sure about that, no guidance is offered in the manual for cleaning the tray or the purpose of the blue knob. Please seek help on the LG Community Forum at https://lgcommunity.us.com. The LG Community Forum is a great resource for getting help from other LG customers. ^Daphane
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