2000 Chrysler Concorde Air Conditioning Smell

It useless keep putting freon in it-it has a leak and losing the oil too-sooner or later the compressor is gonna lock-up. You need to find the leak and fix it-

The foul odor

If a vehicles air conditioner blows out air that smells like the inside of old gym sneaker when the A/C is turned on, microbes are growing on the evaporator. Mold likes damp, dark places. Bacteria can also thrive under such conditions. Besides smelling bad, it can be unhealthy to breathe (ever hear of Legionnaires Disease?).

To get rid of the unwanted organisms, various chemicals can be sprayed on the evaporator directly or through the blower ducts or air intake. Many replacement evaporators have a special chemical coating that inhibits the growth of mold and bacteria. The drainage tubes that carry condensation away from the evaporator should also be inspected and cleaned.

So how would i fix the leak and what kind of chemicals or agents can i use to try to make the smell go away? or what else could be the problem?