વંધ્યું દૂધ ઊકરડે નંખાય.

vaṁdhyuṁ dūdha ūkaraḍē naṁkhāya.

Literally: Spoiled milk is thrown onto the dunghill.
What it means: Anything that is corrupted becomes useless and must be thrown away.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1921) · read from the scan by machine — the Gujarati itself is unchecked · English is machine-made and nobody has checked it yet

Heard it differently, or know we've got the sense wrong? Tell us — that is exactly the kind of correction this needs.