Due to URL changes and parameters on our ecommerce sites, we have a massive amount of duplicate pages indexed by google, sometimes up to 5 duplicate pages with different URLs. 1. We've instituted canonical tags site wide. 2. We are using the parameters function in Webmaster Tools. 3. We are using 301 redirects on all of the obsolete URLs 4. I have had many of the pages fetched so that Google can see and index the 301s and canonicals. 5. I created HTML sitemaps with the duplicate URLs, and had Google fetch and index the sitemap so that the dupes would get crawled and deindexed. None of these seems to be terribly effective. Google is indexing pages with parameters in spite of the parameter (clicksource) being called out in GWT. Pages with obsolete URLs are indexed in spite of them having 301 redirects. Google also appears to be ignoring many of our canonical tags as well, despite the pages being identical. Any ideas on how to clean up the mess?

We are a large catalog company with thousands of products across 2 different domains. Google clearly knows that the sites are connected. Both domains are fairly well known brands - thousands of branded searches for each site per month. Roughly half of our products overlap - they appear on both sites. We have a known duplicate content issue - both sites having exactly the same product descriptions, and we are working on it. We've seen that when a product has different content on the 2 sites, frequently, both pages get to page 2 of the SERPs, but that's as far as it goes, despite aggressive white hat link building tactics. 1. Is it possible to get the same product pages on page 1 of the SERPs for both sites? (I think I know the answer...) 2. Should we be canonicalizing (is that a word?) products across the sites? This would get tricky - both sites have roughly the same domain authority, but in different niches. Certain products and keywords naturally rank better on 1 site or the other depending on the niche.