How clean my grub of duplicate entries

edit

hello pals, let me first tell you what I was doing.

• Installing and uninstalling nvidia driver folliwing the if-not-true-then-false guide.
• Installed Ubuntu 17.10 allong side my windows 10 and fedora 27 systems.
• Changed the ubuntu grub for the fedora grub, you know , it is important if you want select other fedora kernel.

Now my fedora grub has duplicated entries, example:

• fedora (4.14.18-300...)
• fedora (4.14.16-300...)
• fedora (4.14.14-300...)
• fedora ( 0-rescue-...)
• fedora (4.14.18-300...)
• fedora (4.14.16-300...)
• fedora (4.14.14-300...)
• fedora ( 0-rescue-...)
• windows 10
• ubuntu 17.10
• ubuntu (advance options...)

How can we clean the grub?