Cleanse

What exactly are you attempting to Cleanse? Are you saying you're trying to Cleanse Zed's Ult off of you, or that Cleanse won't remove any disables or SS debuffs when you are being Ulted by Zed?

I have watched cleanse cancel the Mark from Zed's ult (the burst of damage after his attack). It happened in the LCS this year. I was surprised because I didn't know it could do that.