Strip   from description attributes in the woocommerce product feed manager from wpmarketingrobot.com

alter-descr-item

<?php

function alter_feed_item( $attributes, $feed_id, $product_id ) {
	
	// Strip &nbsp; from description attributes
  $attributes['description'] = str_replace('&nbsp;', ' ', $attributes['description']);
	
	// IMPORTANT! Always return the $attributes
	return $attributes;
}

add_filter( 'wppfm_feed_item_value', 'alter_feed_item', 10, 3 );