Adding @k1sul1's suggestion from the comments as it's more concise than what I had before:
I just wanted them all gone, so I ran this in the MySQL shell.
UPDATE wp_posts SET post_content = REGEXP_REPLACE(post_content, "\\[\/?vc(.*?)\]", "");
Note the double backslash. If you forget it, you'll replace all v's and c's with nothing, and the shortcodes will still be there. This works for other shortcode as well, just replace vc.
Take a backup beforehand.
@mohamdio your plugin (free & pro versions) don't work with 5.5.3 multisite,... would be great if you would provide the paid support or give a refund.
@gemmadlou I am newbie.... trying to convert from WPbakery to Gutenberg... Can you tell me how to actually use the ".md: file that I downloaded. Thx.
Quick Update... I installed the "Import-Markdown" plugin (network activated)....I tried to import the ".md" file that I downloaded here....
got the the following error: "Unable to create the new post. An error occured."..... :-/
UPDATE: Newbie Woes... I figured it out... this thread was helpful... thx :-)