Tips on Cleaning Cloudy Glass
Below is a listing I received from a friend the other day.  There are a
TON of cleaning tips here. If you have cloudy glass, make sure to read this...
Often when ammonia doesnt work, I put vaseline on it.  Let it sit for 4 -5 days, and that will get it off.
Another way is put it in warm water (not hot or it will crack or get
checks) and drop a couple of polidents in the water.
To get rid of the white mineral buildup in carnival or any kind of bowl,
cup, etc., spread a thick layer of petroleum jelly (Vaseline) on the
deposit and let it sit overnight.  The next day wipe the
petroleum jelly off, wash and the deposit will be gone forever.  Found
this hint in a Collector's Magazine, tried it and saved an otherwise very nice piece of glass - a black amethyst Wishbone sauce bowl.
The thing that worked for me was Pearl Drops Toothpaste!! I put a dab on my index finger and rubbed it into the area with the deposit, and I saw some results!!
I have successfully used something I got at the supermarket called a
'Kraxy Kloth'. It's oil based.  I have a piece that had horrible deposits.
Nothing worked- from toothpaste to toilet bowl cleaner.
On the package it says, among other things, 'removes hard water stains from glass'. One wipe and they were gone.  Brought out the iridescence, too.
Tried it on some other pieces and they changed color until I washed them in dish detergent.
Just had to give an idea for getting rid of the lime deposits.
We had a beautiful (A) Swirl Hobnail rosebowl just loaded with lime
deposit.  Someone suggested putting water in the rosebowl, adding a couple of Efferdent tablets and it worked like a charm!  Try
I would suggest trying something organic if both mineral based attempts failed.  Something like lighter fluid or a paint thinner would fall in the organic category.  If these fail and the deposits
appear to be calcium deposits (lime), you will need to keep trying
increasing strength ORGANIC acid based solutions.  The next step up in the acid category is Citric acid (lemon juice).  Then try reducing lemon juice on the stove to 1/2 the volume in a STAINLESS pan only and letting the solution cool.  Use this on the spots by soaking a paper towel with the solution and allowing it to sit on the glass.  There may be a temptation to use the  and all.  Caution is advised here.  CLR cleaner contains Hydrofluoric acid and this will actually EAT some of the glass.  Read the labels for ingredients looking for Hydrofluoric Acid and avoid at all costs.  
Husband Fred has discovered a new glass cleaning technique.  The hand cleaner product Gunk.  The glass looks great, and there's no residue.
I have had excellent luck with Dow (you know, the scrubbing bubble guys) Bathroom Cleaner and, if necessary, a soft toothbrush.  It doesn't seem to damage the piece, and it leaves no residue or film.