Fill the smelly plastic container with a mixture of half white vinegar and half water. Let the mixture soak in the container for 30 minutes.
Pour the vinegar solution out of the container. Thoroughly rinse the container with cool water.
Examine the container for lingering odors. If the container still smells unpleasant, moisten pieces of newspaper with water.
Place the moistened newspaper pieces in the container. Seal the container and leave the newspaper in the container overnight. Carbon in newspaper ink absorbs odors.
Remove the newspaper pieces from the container. Wash the container container thoroughly with a soft sponge and dish detergent.