How to Make Clear WooCommerce button reset Disabled Swatches?

The Clear button is by default coming from WooCommerce but not the script, you can add custom script below in either your WP Theme or third party plugin (i.e Simple Custom CSS and JS).

<script>
jQuery('.reset_variations').click(function() {
 jQuery('.superSwatch').removeClass("disabled");
 });
</script>

Clear Button Reset Swatches in WooCommerce

Alternatively, you can add the script above to Widget Footer (Insert Text)

add-widget-to-footer

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