Not going to read the entire thread so if this has been said forgive me.
My experience with uncleanliness in a cabin was in a suite on Carnival. When we got in the room I wasnot that pleased it just didn`t seem "right" somehow. The next day as I was pulling the curtain back in the living room behind the couch there was a lot of garbage, dust, hair :eek: I inspected the entire suite I was disgusted even the balcony was a mess, clogged drains full of gunk and there were bugs all over.
I called for the deck supervisor and he came within minutes. He took pictures. I said I wanted all the furniture shampooed pulled away from the wall and all the carpeting shampooed as well as the balcony washed.
Then I asked about the vents he said the filters were changed every 3 months . This was a housekeeping issue.
When we got back from dinner it was a different cabin...shampooed...dusted...furniture repaired. I was a happy cruiser.
Allergies can come from many sources not only the HAVAC system....so inspect, inspect, inspect EVERYTHING.