[Plugin: WordPress SEO by Yoast] Deleting Titles and Descriptions

Perhaps a slightly strange request, but I’ve imported a WordPress site into a fresh installation, but I don’t want the stuff I’ve put in the WordPress SEO title and description fields. I realise I can just type over the existing entries, but until I do so, I’d like them to be blank. Is there some way of bulk erasing the contents? If I uninstalled and reinstalled the plugin, would that work?