Not and have it stay.
Start by sanding the ceiling. make all necessary repairs to cracks, water damage etc. Prime the ceiling with a top quality high hiding primer... if you have water damage be sure to use a non-water based primer, I use Kilz (not kilz 2) with great results. Ten use a Kitchen/bathroom specific paint as your top coat.
Enamel bath.
Because one or more of the ingredients will react (badly) with the enamel.
Stains in an enamel bath may be able to be soaked out. Bleach on a cloth applied to the stain can lessen the stain and may get rid of it. An abrasive cloth such as a "Magic Eraser" may do the trick as well.
You would either have to remove the ceiling in the kitchen or the floor in the bath, and add additional joists to strengthen them, or possibly add steel in combination with the joists.
Bath Crashers - 2010 Sky-high Ceiling - 8.6 was released on: USA: 9 September 2013
A mixture of bleach, bi carb soda and Coca Cola will remove anything. But for a tarnished bath - if it has gotten into the enamel it is sometimes better to buy new enamel paint and repaint the bath white.
A marine enamel or an epoxy paint is your best bet. However I wouldn't expect any paint to last in a bath.
Bath Crashers - 2010 Sky-high Ceiling 8-6 was released on: USA: 9 September 2013
It is normal for there skin to peel but it may be worth giving them a warm bath to check they are not dehydrated.
It is possible steam from the shower or bath is condensing on the ceiling and causing discoloration.
Since an enamel bath tub may scratch, it's best to use gentle cleaning methods. To remove limescale and many types of other stains and deposits, soak the affected areas with vinegar, then wipe off with a sponge. Hydrogen peroxide will also help many kinds of stains.
yes it does because the fan will help you eliminate humidity that can lead to mold, and also ceiling fans can add to the decor quite nicely.