I agree with JDiehl about it sounding like mold growing on your evaporator. There were some heater/ac fresh air intake filters available at one time that might help after the lysol treatment. You should also look up the thread about removing your blower fan and cleaning the heater box out. It gets pretty bad in there, some say.
If your spring weather has been half as wet as ours, the combination of last fall's leaves and the rain water/evaporator water will soon compost the mess and give you a very musty "fresh-wet-earth" smell since the muck is probably plugging your drain hole, too.
I need to do the same thing to get more of the former windshield's glass out of my ventilation system. You have to close your eyes when you first turn the fan on in my truck due to fine slivers and glass dust from the windshield a deer exploded 19 months ago. I can't believe how hard it has proven to be to get all that out of every nook and cranny! Deer hair, too.
That corn-fed 250 to 300 pound Iowa buck tried to jump my entire truck while I was doing 70mph and came right through the windshield and into my face. I have never seen automotive glass explode and pulverize into such tiny sharp slivers and fine dust. No glass "crumbles" like most of them do. I had glass in my face, eyes, ears and butt crack! Was instantly blinded and in heavy traffic, too. Held firm to the steering wheel and slowly veered right while braking until I felt the ditch grass getting deep. Driving blind sucks!
I have my carpet completely out of my truck while I track down and eliminate a water leak and to get all the glass dust and slivers out of it and from under it. In a hard rain, water will run down the back wall of my cab on both sides of the window. It may still be the 3rd brake light, but I'm beginning to suspect the rear window. I have a used power-slider I am going to have the local auto glass shop install. If there is a window leak, those pros will stop it then.
I used my truck to take my family to my nephew's graduation a couple weeks ago. And it, too, had a new bad smell, but it was the stench of burning oil. It got bad enough I stopped and checked carefully for oil leaks twice, especially onto the exhaust manifold, but found nothing. I just changed valve cover gaskets a few months ago and thought one or more might have started leaking again. My oil level was fine. No leaks that I could find, either.
I am now suspecting the breather hose is allowing crankcase fumes to come up through my torn shifter boot. Don't know what else it might be.
Foul odors definitely make for unpleasant hours in the truck.