We analyze the post of the selected post types against the ACF groups in use. Afterwards we remove all data from deleted groups. There’s a dry run available (discovery) to see how many fields would get removed. On the actual cleanup you get prompted because it can’t be undone (so make a backup first). Contribute Developed with ? by whatwedo in Bern. This plugin was created for our own usage to clean a big database from old ACF data. It’s not under active development but can be used (on your own risk).