Use a good quality cream cleaner, light scouring pad from the cleaning section of the supermarket (do not use metal scouring pads)
How can I remove dye stain in the bath
Yes. Bleach, white vinegar and lemon juice are often suggested to remove such stains.
Its a bacteria called Serratia marcescens
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.
HOD DO YOU GET SALT STAINS OFF OF SUEDE SHOES
You could try taking a bath.
Replace bath towels when the nap is worn down or the edges are frayed. You may also choose to replace or repurpose them if there are holes or stains on them.
This should be safe - food coloring is edible and water soluble so there shouldn't be any concerns about toxicity. However, depending on how long you leave the food coloring on the bath tiles, you may have stains left on the tiles after you wash the excess off.
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.
Mr.Clean.
use Vanish
The substances that washes off your skin after a long bath is the sebum.