Hi, A while ago Chrome wasn't cleaning, that seems to have been largely fixed. I did find a problem today though. It's a bit weird, I'm not sure I have all the facts, but I'll tell you and it might ring a bell.
This applies to Chrome.
I have an outlook.com account for skype. Let's call it SkypeUser@outlook.com.
I have a live.co.uk account that I use on Microsoft Virtual Academy (mva.microsoft.com) Lets call it MvaUser@live.co.uk
At this point I have cleaned Chrome with CCleaner. I have all options set to be cleaned. All tick boxes in preferences are ticked.
I select the bookmark for MVA. This takes me to https://mva.microsoft.com/MyMVA/Dashboard.aspx
This bookmark bookmarks the page that is accessible only once you are logged in, so it redirects to the login page (or should!)
What happens next confused me. It thought about it for a bit, went through a few redirects and then showed me a page saying:
"Thank you for registering SkypeUser, welcome to MVA, yadda yadda..."
So from no where it has extracted the fact that SkypeUser had logged in to outlook.com (which is just a microsoft account), and it has now federated to MVA.
Does that make any sense? It took me by surprise.
Wrapping up, some things I know for certain. I had run CCleaner clean on Chrome several times since I last logged in using that account. In fact I haven't logged into the skypeUser account in a month or more and I've cleaned a lot since then.
In Cleaner->applications->chrome I have all tick boxes ticked.
Other stuff appears to have cleaned, it has certainly forgotten other site log ins.
Windows 10, latest ccleaner pro, latest chrome (Version 51.0.2704.84 m)
Thanks and good luck