How to Safely Remove Label Printed on Glass - All Projects Great & Small There is some removal already going on towards the bottom from when I used the citric acid to take off the front label & logo. Directions In a small non metallic bowl, dissolve 1 tablespoon of citric acid in 2 tablespoons of very hot water. Mix in just enough flour to make a thick paste. Apply to desired area and let sit 5-10 minutes.