How do you delete private key data from the browser?

I used a web app, which stores my private key on the browser (Chrome).

I will stop using it, and want to remove the private key data from the browser.

Should I do the 'Settings > Privacy > Clear browsing data'?

Is there any way to remove only the data on that site?

Edit: Don't worry. I don't have money there. I just want to know how to delete private data stored on a browser.

Edit 2: I get it. You should not enter private key into a browser.

But I am asking you how to remove that data from the browser (or the computer) if I already did? I just want to know. I will never put anything in the wallet.