If you can press it in, which is kind of surprising to me because I thought it was only a feature found on later cars, it would activate intensive clean if there were headlamp washers.
Some handy people discovered that there's a wire in the center console that gets powered with it pressed in, as well, and have hooked up a garage door opener to it. Press the stalk in, open the garage or a gate. Sweet.
OBC step sequence can be programmed. Off the top of my head, I think you press the stalk in and hold it until the check control comes up with "PROG", then press the OBC function buttons in the order they're to be displayed and hit S/R.
best, whit