IDispatchMessageInspector does not release resources

Question

I am using IDispatchMessageInspector to monitor a number of webservices. It seems as though the IDispatchMessageInspector is not releasing disposing the requests and replies once it has completed logging them.

Because of this problem it impacting greatly on the performance of the server because it not releasing the memory.

I have tried using Request.close and Reply.Close but that doesn't work either.

Any help would be greatly appreciated

thanks