I recently had to recreate a corrupted search service application on my farm. I tried deleting the service application from Central Administration but the ‘Please wait’ dialog just kept showing and nothing happened. I then tried deleting it using PowerShell using the Remove-SPServiceApplication command. After pressing enter, I waited for about 15 minutes and still nothing happened.
Use stsadm -o deleteconfigurationobject -id “your search service application ID”
This did the trick and the search service application was removed very quickly.