Dishwashing liquid (or dish soap) is a specialized cleaning agent designed to remove grease, food residues, and bacteria from kitchenware. When looking for a 5-liter "Professional" or "Economy" pack, the description usually focuses on bulk value and heavy-duty cleaning power. ​1. Product Overview ​A standard 5-liter dishwashing liquid is a highly concentrated, foamy mixture of surfactants (surface-active agents). These surfactants lower the surface tension of water.