CA: Ask whoever is in charge of the Kashrus place that you work for whose standards they use. Most places like the Star-K have pretty detailed websites explaining what you have to worry about and what you don’t.
A bit of practical advice that I have found: When you have black dots that you’re not positive about, try and catch it on your fingertip. It’s much harder to tell when it’s wet, so let it dry out there then hold it up and look at it into the light. You’ll usually be able to tell if it’s a bug or not once it’s dried out.