tank empty glass wont clean cloudy please help!!!!!!

[joewallace2008]

http://www.youtube.com/watch?v=Dxtt6bHlrWA&feature=related
this video is a set by step on buffing glass
once and for all water stain's removed thanks so much for everyone's info i ordered cerium oxide powder and will buff out with a drill solved once and for all i couldn't find any info on this whole site about cerium oxide powder thanks so much

 

[planedoc]

No problem, that stuff is great on shower doors. I use a green scotch bright pad and just rub it in by hand.

 

[Sk8r]

horrors no, don't sand it!
WHite vinegar is the best and poses no danger, either. And once it has water in it again the cloudiness will disappear.

 

[planedoc]

horrors no, don't sand it!
WHite vinegar is the best and poses no danger, either. And once it has water in it again the cloudiness will disappear.

Horrors?
First post was white vinegar did not work.
Here is a thread, note post 5 where the person says "it worked"
Cerium oxide is same hardness as glass and will not sand or scratch but polish it. It will removed the slightly softer minerals left from hard water stains
http://www.reefcentral.com/forums/showthread.php?p=20316263