Plastic Tub Setup - Chemical/Plastic Smell

I am using a Sterlite gasket latch box for my hatchling setup & am concerned by the chemical smell of the plastic. I thoroughly washed it with Dawn dish soap & water, but that didn’t take it away completely. I did some reading online which suggested using lemon, vinegar, charcoal, sunlight, etc as cleaning agents... wondering what everyone else has done that worked? I wanted to run the tub through the dishwasher, but read that the hot water could actually lock in the smell.
None of the setup videos or forums I read ever mentioned this as an issue or as part of the setup process, so I wanted to see what has been tried & tested before running to the store.
Thanks!!