Multisite remove old pages – dead links

I have inherited the following multi sites:

http://www.skinewgen.com & http://www.instructorcourses.skinewgen.com

I am helping with the SEO and have found that the Instructor Course pages which was previously in the main http://www.skinewgen.com site have been left, live/public in my dashboard. Therefore I do not have a direct link to them from the site but if I search in google they come up.

If I delete these pages and re submit the sitemap for both sites should this solve the problem and start to show the multi sites correct pages?

Thanks