There are many effective ways to clean bathroom tiles; however, the best method depends on tile type.
Most bathrooms use porcelain or ceramic tiles, which are easily cleaned with a white vinegar and water solution with a 50:50 ratio. Simply spray it on and buff it dry. A surfer cleaner and steam mop work just as effectively.
Bleach and highly alkaline cleaners offer every easier cleaning; however, they can be damaging to grout and should therefore be avoided. A water-based solution is the safest option.