Remove Collection from Collection Sitemap

[Casey03]

Hi, 
Does anyone have a simple method (Without using any paid addons) to remove specific collections from the Sitemap, thus informing Google\Bing etc to not index them. 

For example, the collection "New-Arrivals" is causing Google to get confused with a couple of keywords. As this is collection is only really to be displayed on the site and not apart of the SEO Strategy, I want to ensure its removed from collection sitemap. 

There are lots of articles for products etc, but I cannot seem to find a solution for collections. 

Anyone have any ideas?

Thanks in advance. 

[Casey03]

While I still cannot find a solution to remove the unwanted collections from the sitemap. I will use "disallow" in the robots.txt file. 

While its not ideal, hopefully these unwanted collections wont be crawled by the serp bots.