It can be launched by typing Cleanmgr from Start, Run, or going to Start, Programs. This article has a few tips for keeping it clean and lean. This article describes the Disk Cleanup tool included in Windows 98 and Windows Millennium Edition Me. 0/ System Utility Complete Cleanup - Windows 95/98/ /ME/NT System Cleaner Complete Cleanup - Win 95 Utility. The same version of CleanUp! runs on Windows 95, Windows 98, Windows ME, Windows NT 4. 0 Workstation, Windows NT 4. Windows98 has a built-in utility called Disk Cleanup. One of the new utilities for Windows 98 is called Disk Cleanup Manager.