This link has some good considerations on dirty injectors and cleaning them. The second option in the article talks about having a shop remove and clean the injectors. You could save some labor by removing them yourself and sending them out. I would, as a precaution mark each injector so that it is re-installed into the same port.
http://www.babcox.com/editorial/ic/ic30336.htm

 

doesnt matter if you put the injector in the same port of not, if you send em out theyre going to flow different/better anyway