What causes shower door glass to etch?

Shower door glass etching is primarily caused by the accumulation of mineral deposits, soap scum, and hard water, which can corrode the glass surface over time. The acidic nature of some cleaning products, combined with prolonged exposure to moisture, can also contribute to the etching. Additionally, using abrasive scrubbers can scratch the glass, making it more susceptible to etching. Regular cleaning and maintenance can help prevent this damage.