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Does anyone have a recommendation for the best xml sitemap plugin for wordpress sites or do you steer clear of plugins and use a sitemap generator then load it up to the root manually?

I have a client site with thousands of old very low quality links purchased from directories etc over several years - I am certain these are doing nothing for the current rankings and I advised them to stop buying these links 18 months ago when I first started working with them, but do you think pro-actively getting old poor quality backlinks removed will potentially improve the site's rankings?