How can I remove ballpoint ink marks frm my ipad screen protector?

Try milk or magic rubber?

I've always used aerosol hairspray to get out ballpoint ink from fabrics. You could try spraying a little hairspray on a cloth and wiping it over the ballpoint ink on your screensaver. Hope it works.

Or hand sanitizer, gel type. I use it to remove "indelible" inks all the time.

Dip a cotton swab into rubbing alcohol or if you have a can of hair spray, spray the swab with it and rub it over the stain.

Use only alcohol if you don't want to scratch it.

I was able to remove ink from my car seat using alcohol. Put a little on a rag and dab at the stain.