Kep wrote:I delete cookies, cache and history every time I'm finished browsing the web.
Sites that have an auto-login option use cookies to store that you checked that option. Once you delete cookies you will need to keep rechecking that and login on your own.
If you don't want cookies being stored on Chrom* go to
Settings > Show Advanced Settings > Privacy > Content Settings... and then you can select "Block sites from setting any data" and check the box under it blocking third part cookies and data. This will make it so you don't have to keep deleting cookies, and you can whitelist any sites you use frequently by clicking the exceptions button and adding sites there.
It's probably best to do this anyway if you have any privacy concerns.