Arms Reach Mini Co-Sleeper Review

I wanted to share my room with my baby to be, but did have much space in my room, so I purchased a mini co-sleeper on E-Bay.  This came to me well maintained and clean, so I just cleaned the sheets.  Co-sleeping never worked out for us because my husband is a light sleeper, so we packed this product back up into the box and I stored it.  I couple of months ago, I pulled this out and there is some discolor to the item.  So I need to clean it to resell it, but can not figure out how.  I even tried to contact the company, but they have yet to respond.

Long story short, this is a great idea, but how do you clean it?