Tips on cleaning around injector threads?

[CarpeDiem51392]

Above where my injectors screw into the cylinder head (down by the heat shield/crush washer) is totally full of dirt etc. Any tips on cleaning this out? I'd like to remove the injectors and maybe clean them myself (following Jeremy's excellent guide) or pay someone to do this. But obviously I don't want all that crap falling in my prechambers. Should I just use degreaser and blast it out with water? I'm always weary of getting too much water around.
Thanks