NATURAL BLEACH Mix up a paste of two parts bicarbonate of soda to one part lemon juice and get to work on the shower doors, grouting and bath and basin. Allow it to work its magic for ten minutes or so before washing away. The lemon juice acts as a natural bleach as well as attacking the limescale with its acidity.
Cracked, brittle shower grout is an open invitation for mold, mildew and stains to set up house. It will take some time and effort to fix the grout but you will save money by doing the job yourself. ...
Hanafinn Eff-Erayza is a heavy duty cleaner for efflorescence and mineral residues. Eff-Erayza™ is a new technology safer acid cleaner for removing efflorescence, rust stains, limescale, grout haze, mortar mess and fireplace soot. Eff-Erayza™ is very powerful and generally more effective than traditional industrial acids but is non fuming, non-corrosive to metals (except for uncoated aluminium) and temporary contact does not burn skin.
Guy tests 6 cleansers on grimy shower doors. Results: Vinegar sucks at removing soap scum and hard water deposits (I know -- you really want vinegar to work. But it doesn't.) Bar Keepers Friend wins. Of course it does.