Madhiy

“Madhiy is a sticky white fluid that is emitted when a person is thinking of or desiring sexual intercourse. Its emission is not accompanied by feelings of pleasure. It does not gush out in spurts and it is not followed by exhaustion. This may happen to men and women alike, although it is more common among women, as stated by Imam An-Nawawi in his commentary on Muslim.

This only invalidates wudu but does not require Ghusl.