My ipad

Who says you need a Mac?

If you forgot the screen unlock passcode, you will need to restore the device through iTunes on a computer. The computer does not need to be a Mac. It can be a Windows PC that is running iTunes.

See here: If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support

Any computer, Mac or Windows can run iTunes. You will need to use a computer with iTunes and erase the iPad by following the directions in this link EXACTLY: If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support