Magento2 - remove custom theme not composer

Question

Magento2, testing stuff, and created custom themes, did not use composer, so how do I remove theme from system, command line uninstall themes does not seem to work, screenshot below:

simply deleting the folders and clearing cache does not seem to do it.

Answer 1

If after clearing var/cache, var/generation, var/page_cache and pub/static/* folders still you find it there, there is an entry for themes in database table theme with your theme info. Just delete the row containing your theme info and it will be gone from your system.