Citadel's washes are great!

The citadel washes are an excellent way to save time without compromising quality of you minis. They are more diluted compared to inks and leave a matt-like finish on your models. Multiple coats give successively darker shades and they can be wiped off (do it as soon as you apply them) if you are unhappy with the result. Here is the video for the walkthrough.

These pics show how I have used "Devlan Mud", which is a brown wash on my kroot warrior and an ork fro AoBR.