When plastic becomes cloudy, you are left with an unattractive haze that can't be removed with soap and water alone. This can develop on anything from food containers to plastic utensils--especially those items you wash on a regular basis. During the washing process, soap and water sometimes leaves behind mineral deposits or residue that dries and leaves your plastic looking cloudy. This is why it's necessary to use a strong--but safe--cleaning solution that removes the buildup.
Fill the sink with a 50/50 solution of warm water and white vinegar.
Place all of the plastic items in the water, and let them soak for 1 hour. The vinegar will loosen and dissolve the cloudy residue.
Scrub the items one at a time with a wet cleaning rag until cloudiness is no longer evident.
Rinse the plastic with clean warm water. Dry with a fresh cloth.