Yes, you can wash the Flexis tips.
Remove the Flexis tips from the devices. (Do not get your devices wet!)
Drop the tips in a small glass of hot water with a few drops of dishwashing liquid.
Let them soak for 3-5 minutes.
Rinse them off well.
Dry them well with a towel.
Reattach the tips on your Eargo devices (Make sure they are secure before you place the device in your ear again).
When your tips becomes stiff (typically after 3-6 months), it's time to put on a new tip!