How to clear old Software Update data as well as Report Data

Hi,

due to some problems with the software update scan we removed the sup role and the wsus server from our site server. After the removale i checked the Software Updates Console node and saw that all synced updates will still be shown with a grayed symbol in front. Also the reports will show the last scan dates as well as other informations related to software updates.

Is there a way to clean these datas  ? Deleting the computer object will not delete these datas.
How can i clean up such stuff ? Is there an SQL task?

thanks