Baby or other unscented wipes can help for cleaning up at work as well.

I used to commute on motorcycle all the time, and one thing I noticed was that a suit jacket would normally wrinkle a little (because of folding it) once I started hanging my jackets at work, I never had that problem.

but I agree with whats been said. for 5km, just ride in something comfortable, and change at work. towel or wipe down when you get cooled off... change and you are ready for a day in the office.