Deleted your plugin, css still autopopulates. How to remove permanently?

Hi – Certain client site had me trying out some solutions and I installed Gutenberg Blocks Library & Toolkit?but then realized I did not need it for this build. So, I deleted the plugin. No problem with the offerings of your plugin, nothing bad to say — but for this one client, it was not needed.

Now I find your plugin still autopopulates css into various blocks…even though the plugin is not installed on this site.

I have not been able to successfully remove this ghost feature. Note: I don’t think it’s a great practice to have css pertaining to your plugin show up after the plugin has been deleted. Not harmful (maybe), but not a best practice.

Can you please advise? Thanks.