u/Clock-Used

So I've run into the (apparently) very common bad AC smell in my 2017 RAV4 hybrid. It has a brand new cabin filter, and I've used KOOL-IT evaporater cleaner applied both from the evaporator drain and from through the filter box THREE times now in the past month or two. Even after using the cleaner, the smell comes back within 2-3 days. I've even tried drying out the evaporator after drives by using the heater with the ac switched off for a few minutes and the smell still comes back. I also disconnected the drain hose from the evaporator and blew it out with compressed air, but it didn't appear to be blocked in the first place. The smell is driving me nuts, any ideas or solution?? Thanks