My car is blowing out a nasty smell when I use the AC and now even with just air blowing. Cabin air filter has been replaced even though it didn’t smell I tried ruling it out. Smelling in the hole where it goes doesn’t seem to smell bad either. Please help if you can I’m about to sell this thing if I can’t figure it out because it’s disgusting. Also there is no evidence of rodents and I park in the garage that is sealed and has never had a mouse in it that I’ve ever noticed. I’ve heard it can be an ac drain issue but I can’t find anything about it on any forum just general car forums which is no help at all.