Cleaning Tile and Grout?
I have used Clorox wipes or even baby wipes to clean the grout. It is time consuming and hard work as you have to rub the grout possibly with the help of an old toothbrush but it works.
Soap Scum Build Up
I use a dryer sheet. Wet it with water from shower and rub all over door then rinse with cool water and wipe off with spong. Gone, with no harsh chemicals. It really works.