Removing uninstalled application icons

This problem has bugged me know for almost a year. Had Nuke NC installed, uninstalled it but the icons remain in my Applications>Graphics menu

(attached)

How do I get rid of these?

Google Photos

Ubuntu (Mate) 18.04.1 LTS

I think you do the following:

Open Caja. Select Edit Preferences and when the File Management Preferences dialog box opens, look in the extensions tab. Uncheck any that don’t suit you.

Press <Alt>+<F2> then type mozo to open Main Menu editor.
You can find applications here:

and disable unneeded by unchecking checkmarks.

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