Here's a great excerpt from a reader of
Arthur Frommer's Budget Travel magazine, which appears in next month's issue:
<font face="Verdana, Arial, Helvetica, sans-serif" size="2">For long, overnight flights, pack a dry washcloth in a Ziploc bag in your carry-on. Right before landing, ask the flight attendant for a cup of hot (not boiling) water. Very carefully pour the water into the Ziploc bag and then wipe your face and hands with the steaming cloth. It's like having a portable sauna!
- Henrietta Scarlett Ober, Rexford, N.Y.</font>
I don't know about the portable sauna bit, but this sounds like a great way to duplicate the traditional hot towels in J and F. I'd suggest a heavy duty storage bag, like the zipper gallon-size bags you can buy, to store the wet washcloth afterwards.