How do you remove "post_type page" from menu link?

I’m trying to remove some elements from a menu link.

At the moment I’ve trimmed back the output so the menu link contains just the following:

<li class=”home post_type page”>

However, that’s as far as I’ve been able to trim things back to.

My aim is to only have the following showing

<li class=”home”>

To get to the above I’ve modified the “nav-menu-template.php” file. I know I shouldn’t be touching core files but this was the easiest way to understand how the links are created.

So far I do know that this:

$class_names = $class_names ? ‘ class=”‘ . esc_attr( $class_names ) . ‘”‘ : ”;

is what provides the output. The only bit I don’t know is how to stop the output from including “post_type page”

This would then give me just the following

<li class=”home”>

I’ve tried removing all the obvious things within the “nav-menu-template.php” file that might be generating the “post_type page” text but so far without luck.

Any suggestions on where I should be looking would be greatly appreciated.