do what you will

phrase2

1. •
   (old-fashioned) Granting permission for a person to do whatever they want.

   • Do what you will; I wash my hands of it all.
2. •
   (old-fashioned) Expressing that an outcome will not depend on what the person does.

   • Do what you will, you'll never be able to wash all of this sticky gunk out of the crevices.