"is pledge still advisable?"
Yes. one source is Target. http://www.target.com/p/pledge-lemon...11&term=pledge
Currently called Lemon Clean.
"The bellows appear to be cloth based."
Bellows are cloth inside and leather or vinyl on the outside normally. Use the Pledge on the leather, vinyl, or wood parts. For a complete list of materials it works on see http://www.pledge.com/en-US/Products/Pages/default.aspx and click on the yellow can.