Vaishnava Dharmashastra 23.38

23.38

pakṣijagdhaṃ gavā ghrātam avadhūtam avakṣutam
dūṣitaṃ keśakīṭaiś ca mṛtprakṣepeṇa śudhyati //

That (food) which has been nibbled by a bird (except a crow or other such birds that must not be eaten or touched), smelt at by a cow, sneezed on, or defiled by (human) hair, or by insects or worms, is purified by earth scattered over it.