Hide custom field values on website

My previous developer wrote the following code to display all custom field data:

<?php $meta = getProductCustomFields( $product->get_id() ); ?>

		<?php foreach ( $meta as $field => $value ): ?>
			<?php if( $value !== '' ) { ?>
			<p>
				<strong class="field"><?php echo $field; ?></strong><br />
				<span class="value"><?php echo $value; ?></span>
			</p>
			<?php } ?>
		<?php endforeach; ?>

Because of this, even the RankMath data in custom fields were displayed on the website. And after I deactivated the plugin, following RankMath custom field data still existed; rank_math_robots a:1:{i:0;s:5:”index”;}

1. How do I remove all RankMath data from the custom fields?

2. Or, how do I modify the developer’s code above to exclude Rank Math’s custom field data?

Thank you in advance.