Remove classes from wp_nav_menu except custom and current

I want to remove all classes from wp_nav_menu except custom and current.
Currently I have the current-menu-item but I can’t have the custom class.
Any idea?

This is my current code:

add_filter('nav_menu_css_class', 'my_css_attributes_filter', 100, 1);

function my_css_attributes_filter($var)
{
	return is_array($var) ? array_intersect($var, array('current-menu-item')) : '';
}

I’ll appreciate any help 😉