My dishes dull and and the glases have a fulm on them. Both dishes and glasses just don't have a "clean" feel to them. I've checked the arms for blockages and clogs, water temp is fine, and the rinse aid is full. What do i try next?

First perform a vinegar cycle wash in the dishwasher. Pour a cup of vinegar into the bottom of the dishwasher. Keep the temperature at the highest setting possible and perform a wash cycle.Then start using a dishwasher most probably that would solve the problem. If this does not solve the problem then there must be some parts worn out or faulty creating the problem.

There are many probable causes of failure .

To clean the dishes the water temperature is essential.It the water is not hot then the dishes will not be cleaned properly.So check the water temperature.

Also check the filter in your dishwasher.Clean the filter if there is accumulation of debris in the filter

If you are in an hard water zone , then try reducing the amount of detergent used and then try cleaning the dishes