If you want to delete your web pages from Google's search index and cache, you may do it in a matter of seconds by following these instructions. Some of your most private sites may have been indexed by Google, and you may not have known about it. To prevent this from happening, you may use the robots.txt file to notify search engines which sites they should and should not crawl. You may follow this guide if you haven't set up a robots.txt file and your sensitive sites have been crawled by Google and you need to quickly remove them from search results.
google web master tools.
Step-1: Using your gmail account, log on to Google Web Master. a good place to start is https://www.google.com/webmasters
Step-2: In the next step, you'll be able to view all of the websites you've added on your dashboard.Index your web page in google search just an hour
Step-3: You'll be able to view your website on the web master dashboard after that, so click on it.
Step-4: A new dashboard will appear with your website's analytics data when you click the link in Step 4. On the right side of the page, click on the link. Google Index => Remove URLs, then click Temporarily conceal in the new box that appears. Enter the complete URL of the website in the pop-up window and then press the "proceed" button.
Google will delete your link within 24 to 48 hours of receiving your link removal request.