A paste of bicarbonate of soda (bicarb) and water can be used all around the bathroom, from the sink to the shower. Use it with a cloth or a non-scratching scourer.
Never use an abrasive cleaner on baths because it may scratch the surface. A little dishwashing liquid on a cloth is a good alternative.
Clean soap scum from a glass shower screen by mixing 2 parts salt with 1 part vinegar. Rub onto the screen with a cloth (or even fine steel wool), then rinse and dry.
If you have a bad back, buy an extra toilet brush and use it to scrub the bath.
To disinfect the shower recess, and to clean mould from grout, mix 1/4 cup borax with 2 cups very hot water and 1/4 teaspoon tea-tree oil. Shake in a spray bottle until the borax dissolves. Spray on surfaces, leave overnight and rinse.
After cleaning the shower, wipe over the tiles and screen with a few drops of almond oil to prevent the build-up of soap scum.
To prevent the bathroom mirror fogging up while showering, wipe it over with glycerine or a thin film of shaving cream. Buff with a dry cloth.
Re-use plastic orange nets in the bathroom as scourers, or to hold children's bath toys.