1. Run the Powershell command below to uninstall the WSUS:-
Remove-WindowsFeature -Name UpdateServices,UpdateServices-DB,UpdateServices-RSAT,UpdateServices-API,UpdateServices-UI -IncludeManagementTools
2. Remove WSUS database.
For SQL:
Delete the SUSDB.mdf and SUSDB_log.ldf in SQL database.
For WID (Windows Internal Database):
Delete SUSDB.mdf and SUSDB_log.ldf in C:\Windows\WID\Data.
