When cleaning glassware, what is the purpose of using a third tub of water?

The purpose of using a third tub of water when cleaning glassware is to effectively rinse off any remaining soap. After the initial washing and rinsing processes, the third tub serves as an additional rinse phase to ensure that all soap residue is eliminated from the glasses. This step is crucial because any leftover soap can affect both the taste of beverages served in those glasses and the overall drinking experience for customers.

Using the third tub ensures that glasses are not only visually clean but also free from any chemical residues that could potentially impact patrons' health or the quality of their drinks. This process is integral to maintaining high hygiene standards in a bartending environment, where cleanliness is paramount.