There are many commercially available floor cleaners that you can buy. Among them, Lizol is the most popular. It is a disinfectant and comes in various fragrances. You can buy them in 500ml packs or Super Saver Pack, which allows you to save a few bucks. Other brands of floor cleaners include Domex and Mr Muscle, to name a few.
You can buy phenyl, which is also a disinfectant. But, I would suggest you buy white phenyl, which is available in different fragrances, rather than buying the black variant, which has the original phenyl smell. Black phenyl also stains the floor, so it is best avoided.
Some people suggest using acid to clean very dirty floors, but don't do that, since acid is corrosive and damages surfaces.
You asked about salt. Yes, salt is used in mopping water. It is particularly helpful in controlling any infestation. Add a teaspoon of salt in the water used for mopping if you have ants coming into your house.
Adding vinegar to the water is a good way of getting a squeaky clean floor. Use it during the 'mango season' to keep flies out of the house.
Add eucalyptus oil to the water, particularly in the winter and rainy season. It gives a nice fragrance and helps you breathe easy. It is recommended if you have small children at home. I found people living in the Nilgiris doing this. It also acts as a repellent keeping away creepy crawlies and silverfish.
"A love affair with knowledge will never end in heartbreak" - Michael Garrett Marino