CCleaner Cloud will delete all the cookies from an endpoint and some cookies may store information such as log-in details.
If you wish to keep these, you can add a list of cookies to keep.
Go to CCleaner > Options > Cookies, then click on Cookies to Save.
Click the add button to add a domain you wish to keep information for.
If you click on the Cookies on Endpoint tab you can save cookies already on an endpoint.
Load the list, then you can click Save this cookie for domains which you wish to keep information for.