Agniveshyagrihyasutra 2.7.8.15

2.7.8.15

yadi pātrāṇi śunādyavalīḍhe dārumayānyagnau prakṣipet mṛṇmayāni cāpsu prakṣipet lohamayāni bhasmanā śudhyanti \

If the vessels are licked by a dog or the like: one should throw wooden ones into the fire, and one should throw earthen ones into water; metal ones are purified by ash.