Stardrops claims its product is a “multi-purpose cleaning solution, that is effective on limescale and is a traditional stain remover”.
They added: “This hard-working formula is ideal for cleaning most areas of the home including, glass, mirrors, laundry and other surfaces around your household.”
Other suggestions for removing watermarks from shower doors included using Black Harpic, baking paper, tumble dryer water, toothpaste, Astonish and Viakal.
Clare Wood commented: “Black bottle of Harpic toilet cleaner. Just be careful of chrome as it will discolour.”
Keren Capeling wrote: “Depends how bad it is. Astonish limescale cleaner.”
Margaret McGlinchey King said: “Try water from your tumble dryer if you have one. I clean my windows and mirrors all the time.”