@geek.maan. i was having the same issue of choked evap in my suzuki 2016 mehran. I went to ac walas and they all said that they have to take out everything for servicing and eventually losing company filled gas which i was not willing too as the ac in my car is surprisingly chilled.
So what i did, i went to my electrician who heard me and said he can do it. He simply took the dash out, then he opened the airbox with care. We covered the ecu box in plastic and then we drove to the service station where the service guy washed the whole evap. the water was drained thru drain of ac and the remaining water that spilled on car floor was cleaned by dry cloth (my car has ragazine over carpet so water stayed and was easy to clean). you can spread a big plastic sheet to avoid the carpet getting wet.
the result is both the cooling coil and heater core gets cleaned and no gas lost. the electrician did fitted back all the system. pics are for reference.
before:
after washing:
