How often should I clean the lint filter?

You should clean the lint filter before or after every single load. To clean it, pull the lint filter straight up and roll any lint off with your fingers — do not rinse or wash the filter to remove lint. If the filter appears dark or dirty when held up to the light, use hot soapy water and a stiff brush, and make sure it is completely dry before reinstalling. Never operate the dryer without the lint filter or with a wet lint filter. (Page 27)