Insects in glass of milk

Greetings. My question is about a glass of milk. My son took a glass from a high shelf in the cupboard and filled it with milk. Then he noticed a couple of dead insects floating on top of the milk. They were obviously already in the glass. He discarded the milk. Could he have scooped the insects out with a spoon or strained the milk instead? Oddly, this never came up before for us. Thank you!

You can filter the milk through a coffee filter or similar where the bugs would not be able to get through.

Thank you. If it ever happen again, I’ll be glad not to throw out the milk.