Does dish soap need a hechsher?

Answer: No (cRc).

Reason: Dish soap is not food.

Source:

• cRc: dishwashing soap is acceptable without a hechsher, including all dishwashing pods.

Related questions:

• Do aluminum foil and foil pans need a hechsher? No (Star-K, cRc).
• Do paper plates, plastic cutlery and plastic wrap need a hechsher? No (Star-K, cRc).

References: cRc (askcrc.org), “Dishwashing Soap”