Reducing Google+ search pollution
When you do a Google search, look for the icons at the upper right of the window. Click the globe icon to turn off the inclusion of results based on your Google+ stream and your Google+ circle members' streams -- after all, you already have these in Google+.
But this won't stop Google from favoring Web pages from Google+ users in general. To do that, you need to permanently switch to a different search engine, as I explain in the rest of this slideshow for the popular desktop and mobile browsers.