It is narrated from Sayyiduna Abu Umamah al-Bahili (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) used to say to his Companions: "When one of you is in a state of ablution and eats some food, let him perform ablution again, except for camel's milk: when you drink it, rinse your mouths with water."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7615