Removed WSP's features still showing in site collection in SharePoint 2010

Question

some WSP's were deployed in SharePoint 2010 Farm and those WSPs have been completely removed from the Farm and not showing in "Manage Farm solution" section but those features (belong to WSP's) are still showing in site collections of Web applications in the deactivated mode.

Even if I create a new web application and create site collection but still those features are showing in new web app's site collections. what is the issue why they still exist.

Answer 1

First try to find if the solution if still exist using Get-SPSolution command. If still exist, then use the following:

Uninstall-SPSolution -Identity solution.wsp -allwebapplications
Remove-SPSolution -identity solution.wsp -force

You can use Feature Admin to remove orphaned features https://featureadmin.codeplex.com/