Cleaning a cola stain

Cleaning a cola stain

I recently purchased a white futon. There is a cola stain on the mattress. I used oxyclean on it and it basically disappeared. I thought the stain was gone, turned over the mattress and found that it had gone through the mattress to the other side. I used the oxyclean again on it, but it ran to the other side again. Does anyone have any advice to get the stain out completely?
My room

My room

Veggies!

Veggies!

[ManleyHouse Garden] Photos and replanting question

[ManleyHouse Garden] Photos and replanting question

Purple passiflora

Purple passiflora

I think I got what everybody else got

I think I got what everybody else got

Strawberries

Strawberries