I haven't tried those, but be sure to not use the same wipe on both eyes. You'll just be moving them from one place to another.

FYI, since they're microscopic (mostly) he probably didn't see them with his slit lamp. What he must have seen are collarettes, which Demodex leave on the base of the eyelashes. (If you've ever had crusty stuff on your eyes when you wake uo, its collarettes.) Collarettes are debris of mite waste and eggs. (Uggh!) Here's an article about them.
https://www.prevention.com/health/a45102642/heres-the-eyelid-disease-everyone-should-know-about-according-to-an-ophthalmologist/
What kills them are Xdemvy eye drops that are very expensive but worth it. I've used it twice and may need the drops again. It kills them, but they can migrate from your brows, your head or anywhere. I don't know why doctors aren't sounding the alarm about them.

I just ordered the Noveha wipes from Amazon. I've used Cliridex wipes and found them to be the best, but I'd never heard of Noveha. I got less vigilant after using the drops for 40+ days and thought I was rid of them, but sadly, they're always with us, and now I'm sure they're back.

Good luck!