Removing "Archives" and "Categories" from sidebar

Hi, I am trying to remove the “Archives” and “Categories” areas from the sidebar on my site. These show up on all pages on my site besides my home page. I am using the theme ‘Gommero’. I went through the header.php file but didn’t see anything resembling what was posted in other topics. This is not a blog site; it is a site for a small business. I absolutely have no use for the archives or categories sections. I can put a basic text widget in those areas and leave them blank, but a weird background with no text in it still shows up in that area. Any help would be much appreciated!