You can use Eraser : http://eraser.heidi.ie/
This will wipe files and make them unrecoverable.
For login information in browsers, clean your account information using CCleaner with secure file deletion and wipe free disk space enabled.
The best method is to wipe the whole user account.
If your husband has admin access, then he can login as admin, remove his user account without deleting the related files. Then wipe the whole user profile folder with Eraser. This would wipe the whole user profile folder, which contains user's browser history, saved passwords, other documents etc. If your husband has saved documents in another location other than the user profile, then he would have to wipe them too.