I am facing serious problem, I am using Magento Commerce for my ecommerce website and it has total 20 products, but I was surprised to see thousands of links indexed in Google as well as in my webmaster Crawler stats, later on I removed all from webmaster tool and also block crawlers through robots.txt file. Now my question is will these urls still effect my website's SEO? As they still exist and accessible but blocked for crawlers. And is there any better way to block them other than robots.txt. Thanks