Most of that aged yellowing comes from the fumes given off from exposure to wooden dresser drawers, head boards, storage chests etc. Soaking in the Retro-clean (sometimes 24 to 48 hrs) will remove or reduce this yellowing. Expect some of the fibers to have deteriorated or weakened , so hand wash or just rinse after this soaking. I've had good results with this product, and hope you will to.....Good Luck.