Musannaf Ibn Abi Shayba 35:435

Ghundar narrated to us, from Shu'bah, from Qatadah, from Sa'id ibn al-Musayyib, who said: "If you are in doubt, then sprinkle [water over it]." And he mentioned that Abu Hanifah said: "He should not sprinkle it, for water only makes it worse."