What is the chemical change of how does a bathroom cleaning product remove stains in the sink?

Bathroom cleaning products often contain acids or alkaline agents that react chemically with stains, such as mineral deposits or soap scum. These substances break down the chemical bonds in the stains, effectively dissolving them. For example, citric acid can react with calcium carbonate in hard water stains, while bleach can oxidize organic stains. This chemical reaction allows for easier removal of stains during cleaning.