To clean your Wave Flask effectively, we suggest using a sponge to clean the inner part of the flask and the cap.
For the lid and straw, you can use a thin straw brush. While we are currently working on designing a specific brush for this product, for now, a regular thin straw brush should do the job.
For a thorough clean, you can also fill half of the flask with soapy water and shake it to ensure the interior is clean. Afterward, rinse it thoroughly with clean water.
This routine should help keep your Wave Flask clean and ready for use.