To wipe the phone remotely, the ‘Find My Device’ option has to be enabled on your phone.
Now go to https://www.google.com/android/find, and log in with the credentials that you used to login to your device. There you can see all the devices list if you have logged in to multiple devices with the same account.
Now tap on the ‘Erase Device’ option and proceed with authentication using your account credentials. You can feed lost/stolen devices with junk data, but the ‘Erase Device’ option will securely wipe your device.