2005 Subaru Outback Condensate leak

Hello,
I've got A/C condensate dripping from under my dash and onto the passenger side floor mat. I checked the condensate drain hose under the car and confirmed that it is blocked as no water can be seen dripping from it during A/C operation. How do I clear the blockage? Do I have to tear the dash apart? I'm not very flexible and dread the thought of working under the dash. I've considered using compressed air to clear the blockage but think the solution would only be temporary. The service manager at my dealer told me this happens a lot but I've never had a car that developed a blockage in the condensate drain line. Thanks