The banners from the bottom of Joomla! can be removed in the same way, whether is the rhuk_milkyway or JA_Purity template set as default.  (use any of the below methods).

Method 1:

1. In the backend panel, click on Extensions -> Module Manager
2. Look for the "Banners" module and click to disable it.
3. If you refresh the page, the banners should have beem removed

Method 2:

1. In the backend panel, head to Components -> Banner
2. In the Banner Module Manager, look for 2 items: 
   "Joomla! Promo Shop" and "Joomla! Pro Books"  and hit Unpublished.
   If you're not sure what banner represents each one, a picture will be shown if you click to edit the banners.