Toad Oil Bullet

The user converts their chakra into an extremely sticky oil and spits this out as a huge mass. When this oil touches the target, their entire body is covered, and it prevents them from moving. Simply washing the oil away with regular water wouldn't be easy. Furthermore, if a Fire Release technique is thrown at the target after this technique is used, they will be enveloped in flames in an instant.

Reference
Bala de Aceite de Sapo Huile de Crapaud