I have done some testing, when planning to use the Service Catalog. Doing my tests, I have created way to many services. However, if I try to delete one of them, I get a message saying "Template is in use. Has been marked for no further use".

As I understand it, the reason is that I have created some requests, based on that service. However, I'm sure it's only some test requests. 

How can I find out, what requests have been made by that service in the service catalog ?