I clumsily dropped a new cushion I bought when I took it out of the car and it left a black mark on it. It's a cream colored cushion and I didn't realize it when I bought it but it can only be spot cleaned (aka no laundry machine). Does Oxyclean work for things like this and, if you've used it before, which of its products have worked for you? There are so many options!

(Didn't know where to put this so just picked a board that was somewhat related - hope that's ok!)