Well I have the second white condom and it had a brownish stain on the back. It was the first one I used when I got the Neo, but took it out since the stain was showing way too much with the clear shell. I ended up using the second one, which was okay, but had stains in the right areas where it won't show. Anyway I wanted to have the backup one clean incase the first one breaks or wears out. So I took an eraser and started to rub the stain gently, making sure not to rub too hard. I was afraid it would tear or wear out too much. After a few minutes, the stain is gone. Now its white again. So give it a shot if you have a white Neo condom with a stain. Make sure you use a white eraser.