I wear gloves when I'm administering eye drops, nose spray or ear drops. Aside from the fact that it's what we're supposed to do, I don't like getting that stuff on my hands and sometimes the bottles leak.
I currently have a resident who's family member points out to me that they never use gloves to administer eye drops every time I put mine on. Every time I explain why I wear them. This adds up to ten times a week.
Next time they tell me that they never wear gloves, I'm going to ask them "Why not?" Change it up a bit. Maybe they'll get the point after the tenth explanation. Or, maybe not.