How to remove custom product attributes on module disable?

I added 2 custom product attributes with the help of setup/InstallSchema.php in my Magento 2 custom module. It’s working fine. But, I can’t remove these Product attributes on module disable from the site admin module manager section. I write code for remove attributes in setup/Uninstall.php file like the following public function uninstall(SchemaSetupInterface $setup, ModuleContextInterface $context…