WD-40 is a multiuse product found in many homes. From fixing hinges and gears to protecting against rust and corrosion, WD-40 can also remove hard water stains.
Ten Things We Use WD-40 For (Besides that Squeaky Door) - Chris Loves Julia
How do you remove this build up from hard water? : r/Home
I was sick of hard water stains all over my shower doors - I found a cleaning solution to make them sparkle & it cost 1p
Top 10 hard water stain remover ideas and inspiration
WD-40 Hacks to the rescue - Chas' Crazy Creations
Cleaning hacks: TikToker shocked by the results of a viral baking paper cleaning hack for cloudy shower glass - 9Honey
House Cleaning Tips You'll Use Again & Again! - DIY Candy
The 7 Best Cleaners for Glass Shower Doors - ANDREA JEAN
How to Remove Hard Water Stains From a Glass Shower
WD-40 11052 Straw, Multi-Use Product, 8 oz, Amber: : Industrial & Scientific