Jenkins - Uninstallation Server & Slave

 Here is the straight forwards steps to uninstall Jenkins Server and Slave software from the machine.

Jenkins Server uninstallation:

•  Go to Add / Remove programs and remove Jenkins (Major.MinorVersion). 

Jenkins Slave uninstallation:

1. Login to the machine where Jenkins Slave is installled and run “sc delete jenkinsslave-D__Software_jenkinsslave” from command prompt to delete the Jenkins Slave service.
2. Restart the machine and verify that the Jenkins Slave Windows Service is deleted.
3. Delete D:\Software\jenkinsslave on the Jenkins Slave machine.

The above Slave uninstallation steps comes handy to remove the current instance completely in case of any issues.

Refer here for Jenkins - Installation & Configuration.