For those who really need a cleaning and have never gotten one, no, and can actually be quite painful. It can even be bad enough where you can bleed from removing very compacted wax. That's how I learned the hard way to stop using q-tips for my ears. :meguuusad:
For those who do some proper...
He did actually catch a glimpse of the other AI the one time he borrowed a high-end scanner for training, which I imagine was the first encounter. Nelia could also see Alpha once she equipped a high-end scanner, so it might just be a matter of time (or luck if Katsuya somehow stumbles upon one).