Remove all cloze deletions at once from a document

Often I want to remember the precise key-words of a text, and I do this with cloze deletions. After a while they are not necessary anymore, so I would like to delete all the clozes from the note to form better and more concise flashcards out of it.

I can find no option to do this easily with one command. So I have to delete all clozes manually. This is very time consuming.