A quick guide to remove/inactivate effects from the Active Effects list, that stay after removing mod, in case you didn't unequip the item.
Link to video: https://www.youtube.com/watch?v=UWcM31GEItc
Link to all ID's: http://en.uesp.net/wiki/Skyrim:Powers


Details:
In the video, I show my my character, which I gave a ring from a mod. The ring gives me 40% to Sneak.
Then, I removed the mod, but I forgot to unequip the ring.

Result: a "ghost effect" - an active effect, even tho I don't have the item anymore.

What is the problem? I can't remove the effect, and my character become overpowered. in other cases, it may get negative effects that harms it.

This video come to teach how to remove all effects, and then adding them again, without the "ghost".