What is the ruling on the prayer of one who wakes up and finds wetness without recalling a wet dream, and is his prayer invalidated after washing the site of the wetness?

The fluid that exits has several scenarios: 1. If it is confirmed to be maniy (seminal fluid): One must perform ghusl (ritual bath) from janabah (state of ritual impurity) and repeat the prayers that were performed before the ghusl. This is the view of the majority of scholars. 2. If it is certain to be madhiy (pre-seminal fluid): The prayer is valid if the madhiy is washed off the body and clothes, followed by wudu (ablution) and praying in clean clothes. 3. If the nature of the fluid is unknown (doubt whether it is maniy or madhiy): You have a choice: If you consider it maniy: You perform ghusl and repeat the obligatory prayers you performed before the ghusl. If you consider it madhiy: Your prayer is valid if you wash the impurity of the madhiy off your body and clothes, perform wudu, and pray in clean clothes. This is the view of the Shafi'i school.

And if you consider it madhiy, it suffices to wash what the madhiy has touched of your body and clothes, then perform wudu, and your prayer will be valid.