Are you referring to the outside plastic cover that sits on top of the roof unit? My cover has 4 screws (two in front, two in back, maybe there were four in the back, but I'm not gonna climb up there and look). I have removed these and cleaned before, but it wasn't too bad. The inside filter needed more cleaning
If you have rivets on the outside cover, does this mean the cover is a slide and lift style? Maybe you slide it forward or backward then up, or pull up and slide off. Maybe check underneath for a release and the cover hinges up and/or off.
What is the make and model of your A/C? Hopefully someone with the same model has done this.
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