I have removed multiple layers from Open Data and layers are still showing in Open Data Portal with a 404 error.
Process
Removed layers
Waited 24 hours
Open Data Hub and refreshed the items
Manually refreshed items in question
Some Stale items will not remove from Open Data
Example:
http://data.iowadot.gov/search?q=pavement&sort=name
Click on 2013 International Roughness Index or 2013 Pavement Index. These along with the 2014 & 15 pavement friction and indexes have been removed from the groups that feed open Data.
Thoughts? I may open a ticket after another 24 hours.
