Decontaminate (verb)

1. To remove or neutralize contaminants or harmful substances from an environment, person, or object.
2. To cleanse an area or a thing from a dangerous or unwanted substance.

Origin:

From de- + contaminate, from latin contaminare, from con- + -taminare ("to make unclean").

Examples:

1. The workers were required to decontaminate themselves before entering the clean room.
2. The area was decontaminated after the chemical spill.
3. The hospital staff decontaminated the patient before moving him to the isolation ward.
4. The team had to decontaminate the water supply before it could be used.
5. The equipment had to be decontaminated after the experiment.