That is indeed a great site. However if the problem is glass sickness (glass disease) (very common in old decanters and vases) then short of mechanical / abrasive techniques, there is little that can be done.

http://glass-studios.net/sick.html

If you only want to display them in your own collection, then filling them with liquid, or spraying inside with oil will render the cloudiness invisable. Obviously you DON"T do this to items you may want to re-sell.

I can't tell you the number of old clear glass items I have attempted various cleaning methods on; they all look exellent when wet but when dried - the dreaded glass disease has struck again!