Funny I do the exact opposite on my 4 holden commodore.
I bought a special intake kit for it that came with a Green filter - so I bought there cleaning kit. However my Holden came with a K&N Filter in the air box.
Since the intake kit didn't fit that well - I sold it off. but kept the Green Cleaner and oil kit.
And I use their stuff on my K&N panel filter. I will tell you there cleaner works better. Also their green dye oil (that I think is actually the same as the K&N oil) makes covering the filter easier. Since its darker you don't use as much because you can see it in the guaze.
also their oil supposedly doesn't bother MAF sensors - not sure about that but whatever.
having used both - I know full well it doesn't damage the gauze. so I will keep using the green kits.
But I would also suspect the exact opposite it true too. I find the Green stuff is a touch cheaper for more cleaner and oil. but either way.
If guns kill people, spoons cause diabetes.
My other car is a 4 door family car.