I pretty much do same as what I would do on the face, I see more gals who just don't ever exfoliate the back, and a few with acne. If it's mainly dead skin buildup I will use a good exfoliateing scrub-like salt/sugar etc., with acne, I will use either a 1-2 layer peel or emzyme peel followed by extractions.
For forward contracts, settlement of the contract occurs at the end of the contract. Futures contracts are marked-to-market daily, which means that daily changes are settled day by day until the end of the contract. Furthermore, settlement for futures contracts can occur over a range of dates.
The second article you linked to (on delivery price) states it best: In forward contracts, the forward price and the delivery price are identical when the contract begins, but as time passes, the forward price will fluctuate and the delivery price will remain constant. In short, the forward price only equals the delivery price the moment the contract is created. After that, they can, and almost certainly will, differ.