Formica, Tile and Cermaic

If the shower is only mildly dirty, then lemon oil will clean it beautifully.  Pour a generous amount of oil on a soft rag and wipe down the shower walls.  It will take several applications to cover the whole shower.  With a clean cloth, rub the shower dry.  Some people like to put lemon oil in the spray bottle and spray it on the shower.  This works well too, but be sure to cover the floor of the shower or bathtub with a towel or other rag, because the oil will make it slippery.
If the shower is really moldy or has bad hard water stains, use Lysol Toiler Bowl Cleaner.  It will not harm the shower.  This is strong medicine, but not nearly as strong as some of the hard water cleaners on the market that really gag you.  Squirt the Lysol cleaner on the shower walls and scrub with an SOS pad or nylon brush.  Don't get the cleaner on the metal fixtures.  It will pit them dark.  Be sure to use rubber gloves to protect your hands. Rinse the shower and wipe it dry.

A sign to be hung on the door

for a mother with lots of children;

BATHROOM-Seating Capacity One!