This applies to both WSUS servers and also SUP (Software Update Point) servers in SCCM. Have been in several projects and setups where the WSUS doesnt have any clean-up tasks or strategies in place so i created one to share which should help give a maintenance plan to ensure they are healhy www.walshamsolutions.com/SCCM-WSUS-Cleanup-WSUS-Strategy-maintenance
Will eventually get this into the Technet Wiki pages but i need to get more points in order to gain privileges so in the meantime i have them on my website