Scrub them with white toothpaste.

http://lifehacker.com/software/cleaning/how-to-clean-cloudy-drinking-glasses-236413.php
There are also a ton of other good suggestions in the comments of this article.

If you own your home, you may want to test your water. A water softener often resolves this and other problems.
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It sounds like you have hard water deposits. If you have a water softener you should check it to make sure the salt content is at proper level and check to make sure the unit is functioning as it should. You can call a plumber to come and check it out or call your local water purification store. When I was renting a small flat I had this very issue and what I did was buy a water softener in a detergent crystal form called "Calgon". I would add it to the wash water when I washed my dishes and I this eliminated this issue. I included some links giving information about hard water and calgon. Hard water can be tough on clothes as well, I would also add the calgon to my wash water for clothes and it helped with that as well.

--Quote-- taken from the website of the third link I have supplied to you
When washing dishes, especially in a dishwasher, hard water may cause spotting and filming on your crockery. The minerals from hard water are released faster when it comes into contact with heat, causing an increase in the amount of spotting and filming that occurs. This problem is not a health risk, but it can be a nuisance to clean and reduce the quality of your crockery.
--/Quote--
Source(s):
http://www.water-treatment.org.uk/drinking_water.html
http://www.homesolutionsnews.us/calgon/
http://www.hardwater.org/hard_water_problems.html

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I just moved to an area with extremely hard water. What worked for me was to start using Jet Dry in the dish washer.

Also, you may make sure you water temperature is not too low. The dishwasher has to heat the water to the appropriate temperature, and the longer it takes, the more the film is baked onto the dishes.
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A product called goo gone . Works like a charm!

http://www.magicamerican.com/googone.aspx
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