wp_query custom post type by custom field

So I have something like this..

<ul>
$custom_post_type_two_id = get_the_ID();
$args = array(
	'post_type' => 'custom_post_type_one',
	'posts_per_page' => -1,
	'meta_query' => array(
		array(
			'key' => 'custom_field_one',
			'compare' => 'LIKE',
			'value' => $custom_post_type_two_id,
		)
	)
);
$advanced_posts = new WP_Query( $args );
if ($advanced_posts->have_posts()) :
while ($advanced_posts->have_posts()) : $advanced_posts->the_post();
echo '<li>' . the_field('custom_field_two') . '</li>';
endwhile;
endif;
wp_reset_query();
</ul>

What I’m trying to accomplish is I don’t want the displayed list item custom field to be repeated. So I want it to dig through the ‘custom_post_type_one’ ‘custom_field_two’ posts and only display each unique field information list items once.

So right now it may look like this..

<ul>
	<li>Car</li>
	<li>Boat</li>
	<li>Car</li>
	<li>Truck</li>
</ul>

When I want it to do this..

<ul>
	<li>Car</li>
	<li>Boat</li>
	<li>Truck</li>
</ul>

Notice the extra ‘Car’ is gone, because it was repeated and not necessary.