to make germ-free
Chemical sterilisation (also spelled chemical sterilization) refers to a technique of sterilization making use of a chemical agent.
Contents
Objects can be sterilised with products like formaldehyde.
to make infertile
Individuals (people or animals) can be made sterile or infertile with chemical (biological) agents and The Pill.
References
Chemical sterilisation Wikipedia(Text) CC BY-SA