No, dishwater does not necessarily need to have bubbles in it to clean dirty dishes effectively. Bubbles or foam are often associated with dishwashing detergents, and they can help indicate that the detergent is working by breaking down grease and other food residues on the dishes. However, the absence of bubbles does not mean the detergent is not working.
The cleaning power of a dishwashing detergent primarily comes from the chemical agents within it, which work to dissolve and remove food particles and grease from the dishes. These agents can still work effectively even without producing a lot of bubbles or foam.
That being said, some people may prefer using detergents that create bubbles as they give a visual indication of the detergent's activity, which can make the dishwashing process feel more satisfying. Additionally, bubbles can help to lubricate and create a slippery surface, which can aid in scrubbing off stubborn stains. However, a detergent's effectiveness is not solely determined by the presence of bubbles.
So, while bubbles can be helpful, they are not a strict requirement for cleaning dirty dishes effectively. The key to getting dishes clean is using a good quality dishwashing detergent, proper soaking, and scrubbing to ensure that all the food particles and grease are removed.