One basic rule in autocrossing: it's a future thing! Never think (for even a millisecond) about something that has already happened. Also don't think about what you are doing right now...it's too late to do anything about it! Always use 100% of your left brain to devise strategies for what to do next! And 100% of your right brain executing tactics which will complement these strategies.
A good trick is to disable the wipers! Even old pros sometimes hit the wiper lever, but if you disable them, nobody will know when you hit it. Most early 911s have several round electrical plugs under the dash...one disables the wipers and nothing else important. It only takes a few seconds to pull it out. On other cars, remove the fuse for the wipers. Don't forget to undo whatever you did to disable the wipers after the event!