Grout Cleaning

So you have To clean your Grout

First clean the grout with water and allow to dry completly. This will take away most surface debris.
Be sure to never use bleach especially on colored grout, it will discolor the grout.
Use a stiff brush for scrubbing.
I do not recommend using an old toothbrushthe bristles will be too soft. Also avoid using metal bristles, as they will wear away the grout and possibly scratch the tile. This will create another headache.
While using cleaners make sure the room you're working in is well ventilated.
Ware gloves and protective eye wear when working with any cleaners.
Test your grout cleaner on a small, inconspicuous area first to make sure that it won't erode or damage your grout. This is especially important if your tile grout is old, fadded or damaged.
Always read cleaner warnings and follow the directions.
Never combine cleaners it can cause a reaction that could physically harm you.
When cleaning grout always use patience and elbow grease.