1) Clean 2) Cleanse 3) Rid of contamination 4) To make free of contamination 1) Cleanse 2) Purify 3) Sterilize 
To remove the contamination
To remove the contamination
[v] - rid of contamination
verb rid of contamination; `The soil around the housing development had to be decontaminated by the city`
to make (an object or area) safe for unprotected personnel by removing, neutralizing, or destroying any harmful substance, as radioactive material or poisonous gas. · to make free of contamination; purify: to decontaminate a sickroom.