Yes, the Popper Bowl can be washed in the dishwasher. It's made of BPA-free silicone, so treat it like other silicone cookware you have in your kitchen.
If your Popper has a lingering popcorn or detergent scent, try putting the bowl (only the yellow silicone, NOT the white plastic parts) in a 350-degree oven for thirty minutes.
Alternatively, you can try a vinegar soak. Soak the silicone bowl in distilled white vinegar for about 30 minutes. Rinse it well and dry with a cloth.