To ensure that glass wares is properly cleaned, the film of water which adheres to the inner glass wall of the glass ware as it is emptied must be uniform.

• A. True
• B. False
• C. Not important
• D. Sometimes

Answer: (A)

Uniform wetting of the inner surfaces is essential because it shows the glassware has been rinsed thoroughly and is free of residues. When water spreads out as a smooth, continuous film, it indicates good wetting and that detergents, minerals, and contaminants have been effectively removed. This even film also helps the ware dry evenly and reduces the chances of water spots or residue forming as it dries. If the water beads or forms droplets, some areas haven’t been rinsed or cleaned properly, leaving residues that could contaminate future use. So, a uniform film is a reliable sign of proper cleaning.