If the coil that's dirty is inside your condo, it's an evaporator. The condensing coil lives outside and usually doesn't get clogged unless grass and leaves have blocked air passage.
Provided you can gain access to it, vacuuming, compressed air, and treatment with a spray bottle of something like Alka-Brite followed by a water rinse (don't let dust and crap clog the condensate drain line from the evaporator) will improve performance. Address the root cause-why is the evaporator filthy? Proper fitting filters do much to preclude that.
Finally, there's a leak sealing product for R22 based residential systems which sells for around $50 at HVACR and appliance parts distributors. That might be a cost saving way to get you through this.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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