Next time (if there is a next time), you might want to just buy the
finish you want to begin with. Lots of companies sell "antiqued"
brass hardware - this one, for example:
http://houseofantiquehardware.com/s....gory.139124/.f

I've used them for window locks and sash lifts, as well as one door
lockset and a set of hinges. I've never bought their receptacle or
switch plates but I'm sure they're just as good. I don't ever think
chemical aging looks really real (truly antique brass patinas
unevenly, whereas the chemical stuff is always a little too perfect),
but you're probably not going to do any better yourself than just
buying something that's pre-finished. And you'll save the time and
effort.

- Jeff