GLC, you have a light in your washer?

On keeping the washer clean, besides leaving the door open, we now give it an occasional dose of a product called Smelly Washer. No kidding. I turned to this product because, after about 7 years of doing nothing other than keeping the door open, we started to notice a foul odor when the machine was run. It initially took about 4 repeat smelly washer cleanings before the odor was gone and now I just do it once every month or two.