Baking soda can be a great tool to remove laundry odors. Another big part of removing odors from laundry is water temperature. If after washing your clothing in the hottest water recommended for the fabric and adding baking soda and your own laundry detergent, the clothing still smells fishy, you may have to opt for a soaking. Fill a large bucket with very warm water. You can add baking soda, laundry detergent, or a laundry odor eliminator product. Place the clothing in the bucket, using a clean white towel to hold the clothing down. Soak for 30 minutes to 1 hour. Wash the clothing normally and then try line drying in the sunlight. These extra methods will help you get out even the most stubborn fishy smells.