What's the difference between abstergent and abstersive?

Abstergent

Definition:

• (a.) Serving to cleanse, detergent.
• (n.) A substance used in cleansing; a detergent; as, soap is an abstergent.

Example Sentences:

Abstersive

Definition:

• (a.) Cleansing; purging.
• (n.) Something cleansing.

Example Sentences: