I have disabled the cloud for Skyrim, but i still have 80mb in the cloud data, how i delete that ??

1. re enable cloud, start Skyrim and select cloud as your storage option. Then choose to "load" but dont load, instead when you see your save list you can press X to delete your saves.

or

2. Go to your storage option in your xbox, select the cloud storage device and delete your saves.

method 1 is easier in my opinion.