Just like any other reusable product, your Cup should stay clean before and after insertion.
“But what if I’m not at home and I need to clean my cup?” No worries. Below is a handy guide for the best way to take care of your new companion, no matter where you are.
First time users:
Check that the air holes around the top are fully open. Wash your hands and clean your cup with water and mild soap (seriously, none of that scented crap!)
Boil it in a large pot for 20 minutes before you use it for the first time.

At Work, I Can't Wash my cup with the Washing Liquid. Should I Wash the Cup with Perfumed Soap or Tap Water?

No. Perfumed soaps with unknown pH values might coat the cup with a layer of irritants that could damage the precious mucous membrane of the vagina. Some of these soaps may also contain agents that might damage the silicone. It's better to wash cup with tap water than use the wrong kind of soap. Cup is smooth on the inside, making it easy to clean with water alone. 

How to clean menstrual cup in public toilet?

Don’t worry, we’re not going to tell you to run to the sink that’s on the other side of the bathroom stall. Remember that cup can hold blood for up to 12 hours! However, life happens, and we understand your fears.

How do I know if I’ve cleaned my menstrual cup well enough?

When your cup is clean it doesn't have any colors, smells or oily residue on the surface.