For better results, you can let the soap solution sit for about 15 minutes before rinsing. Washing your plastic normally might get rid of the bad plastic smell.
This option works well for any bad scent in your plastic, especially reusable water bottles.
If your plastic is especially smelly, you can let the baking soda sit for longer. This strategy works especially well with plastic bottles.
Try using lemon juice to clean your containers, bins, and other storage items! Instead of lemon juice, you can use a bit of lemon or orange zest. Let it sit in the plastic item for 10-15 minutes, then rinse it out.
If several days have passed and the plastic smell is still there, you might want to try something else. This is an especially handy trick for plastic containers.
This works well with any plastic item that comes with a lid.