How often should I clean the lint screen?

You should clean the lint screen before each load by rolling lint off with your fingers. Do not rinse or wash the screen to remove lint, as wet lint is hard to remove. Additionally, clean the lint screen with a nylon brush every 6 months or more frequently if it becomes clogged due to residue buildup from laundry detergent or fabric softener.

From the official Whirlpool WED4985EW Electric Dryer with Wrinkle Shield manual, page 9

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