Disconnect the vent hose, use a dryer vent brush or vacuum attachment, and scrub from both ends. For deep cleaning, hire a professional duct cleaning service.

Yes, if you have electrical/plumbing skills. Ensure proper water supply, drain line, and GFCI outlet connections.

Run a cycle with 1 cup white vinegar in a bowl on the top rack, then sprinkle baking soda on the bottom and run a hot cycle.