How can I delete the problem file from Trados?

Hello, 

I want to delete a single doc from Trados.

It had a problem, so I want to completely delete it from Trados.

How can I do that?

I heard that when I delete it from the list, it still remains in Trados.

(And I did it already. So it's not on my project list anymore.)

Should I delete its drop file from my computer?

Will it be all?

Thank you.