Glass drinking glasses don't last forever. Overtime, hard water, detergent, acidic beverages and heat will etch the glass. The etching creates a rough surface that grabs particles. You'll get a coating of particles along the inside. You can see that the clarity of the glass is reduced compared to new glasses.
I would recycle the old glasses and buy some new ones. I recently spent $40 for 12 16 oz and 12 7 ounce glasses by Libby brand from Target. They're very nice and sturdy.
Another thing we did was install a water softener in our home. This greatly decreases wear and tear on dishes, clothes, bathroom fixtures and my hair and skin. It cost about $500 for everything installed.
To clean your dishwasher, place a cup of vinegar on the middle of the empty machine and run a wash cycle. That will take off some of the scum.
I would go back to Cascade detergent and continue to use jet dry. I've experimented and found these to be the best combination. Also, avoid lemon scented detergent, it is known to etch glasses too.