1995 Honda Civic Condenser

Ok I'm having trouble with my A/C, well the pressure is good and it does not need any freon. After driving the vehicle for about 20 min the ac doesn't work, is still throwing air but not cold. I took the glove box out where the condenser sits behind it with a cover I took the cover out and it was very dirty after cleaning it with compressed air and a brush. It seems that after doing all of this the condenser still gets to a point that freezes and stops throwing cold air. Is there seething else I can do? Without having to replace the condenser since my budget is low? I would apretiate simeones help