You can decrease token supply if you are the token issuer or burn any spam tokens if you no longer want to see them in your Waves.Exchange account.
Open Waves.Exchange app and log in to your account.
On the Tokens tab tap on the required asset.
In the following screen that opens you will find Available balance, Last transactions and Asset info (Token info). Scroll to the bottom of the page and tap Token Burn.
In the following screen that opens specify the required quantity of tokens to burn or tap Use total balance, then tap Continue.
In the following screen that opens check the entered data and if everything is correct, tap Burn.
Warning: Be careful, the burning process cannot be canceled.
If you have any questions related to Waves.Exchange, feel free to contact us via customer support.