Beta blockers leave the system through the kidneys & liver - about 50% the first 24 hours, the remainder gradually over a number of days. I am not sure if there is anything you can do to hurry the process.
Here is a description, with links to several articles, of how the elimination works: https://pubmed.ncbi.nlm.nih.gov/1982759/
What is your concern about the beta blockers in your system?
Sue