Only Mac App Store apps can be deleted from Launchpad. If they weren't installed from the Mac App Store, you have to remove them manually.
First, search in Internet if they come with an uninstaller. If so, use it. However, a lot of apps don't require an uninstaller, so you just have to open a Finder window, choose Applications in the sidebar and delete the applications manually. Don't use any cleaning application unless you want to damage something, although they may work once