Maybe THIS reporting of the issue will get it done.

Thank you for your request. According to our system, we already have an open service request of this kind at this location. Your request has been combined with service request #655803. If you would like to check the status of the request, please contact the Public Works Call Center at 510-615-5566 or pwacallcenter@oaklandnet.com. This issue can also be followed by watching http://seeclickfix.com/issues/2596831.

If you don't clean them up, we have to keep reporting

City of Oakland Public Works Department addressed this issue on 06/27/2016, service request #655803.