When I used IEMs several hours a day every day(mostly Etys, or CIEM), I had to use one of those sprays to dissolve ear wax because my ear was just making too much, trying to help remove one hell of a big foreign object I’m guessing. In my case once a month or every other month was plenty. You don’t want to abuse it, as after all, wax has a role to play in our ears. That, and gently cleaning the entrance of my ear canal when showering(as far as a finger goes, and rinsing gently with warm water) so that I wouldn’t push what was almost out back in with the IEM, was really all I needed. Each time I got my ears checked(doctor, or audiologist for new molds) they said my ears were clean.
It seems obvious to me that one flange on IEM you can barely insert isn’t as susceptible to push and stock ear wax deep down the canal as Ety’s products and triple flanges or big foams inserted just short of a lobotomy. When wearing earbuds, I never even had to wonder about ear wax so I’d say there’s an impact from IEMs. But at the same time, most people push more wax using cotton swabs deep into the ear canal(should never be done) than you’ll do with an IEM.
Somehow all the audiologists I’ve seen, mentioned baby oil at some point, so there must be something good about having some in the ears. People here put some on the tips to lubricate them, seems like a universal fix for ear stuff.