For us 6' 2" types with fat fingers that can't get up the cabin filter housing easily? Would it not be just as easy (maybe easier?) to shove the Klima Cleaner hose up the evaporator drain tube and into the evaporator box? It's really really easy to expose the drain tube by removing one fastener on the console panel trim cover.
YUK !!!! Not exactly healthy handling the drain tube.
At my Buddy's shop, they zip tie the Klima Cleaner hose to a Borascope and feed it up the cabin filter hole to the evaporator, seem to work for them and you don't have to down in the footwell smelling the stuff when you're spraying.
At Home, since I have bought the Klima Clean product several times I have extra hoses that I have adapted (slightly open the hole in the adapter) to use with
cheaper cans of Lysol, so I alternated between the two products, only using the Klima Cleaner when it's really bad or being a long time.
Found this Video:
https://youtu.be/v1j_nQi8WPA
Cheers !!!