Possible Script to Clear All Browser Cookies?

I’m looking for a script or RMM plugin to clear cookies/cache from Chrome, Firefox, Edge, etc. I have a client that is required to do this every 30 days and they want to automate it.

That is a really odd requirement. I bet they love having to relogin to everything monthly.
IIRC there’s a bleachbit script in the library, you can customize that to clean what you want.