that sucks. im really sorry dude. if you are really in a bind and think you have any chance of saving anything, you can put some icecubes in 2 ziploc bags (make sure they dont leak, maybe tape the seam of the inner bag) and it will bring down the temp, though depending on the size of the tank, and the number of icecubes you have, it might take a little while. just be careful not to lower the temp too far too fast as you dont want to shock anything. i know that doesn't make a lot of sense, but...
I really wouldn't wash the stones. i would just remove any coral that is obviously dead, as it will keep decaying, and do a few large (25-50% if you can swing it)waterchanges over the next few days. i would also keep testing the water pretty much daily until things get back to normal.
the other members have made some good suggestions about how to keep your temp in check in the future.
other than that, the coralline algae (the purple stuff) will come back once your tank stabilizes.