Pour all the ingredients into a spray bottle, shake well and spray on the shower door glass. Act for 10 minutes, then pass a sponge to clean well and remove the limescale.

Then pour water on the glass to rinse, then dry with a clean cloth and make a last pass with newspaper, to polish the glass.
White vinegar and baking soda

Heat about 250 ml of water, then pour into a spray bottle, add two tablespoons of white vinegar and two of baking soda.

Spray the solution on all the shower glass and let it act for 15 minutes, then clean well with a sponge to remove all limescale.

Finally, dry well with a microfiber cloth. Apply this technique at least once a week.
Water abrasive paper

This product is used by bodybuilders to finish car paints. It is abrasive paper, similar to sandpaper, but water. Be careful to buy the right product to avoid scratching the shower glass.