I am not really sure how the ledger is attached, but I saw the contractor who framed my house (he put it up when it was built) use some big friggen screws.I've had decent success w/ Mr. Clean Magic Eraser and a crapload of elbow grease (on TT XLM - similar to AZEK). Just keep workin' it, I destroyed two erasers but the scuff mark was 80-85% lighter when I was done.
Deck looks good from the pics, w/ the exception of the concrete footings (too small) -
Please answer these:
How did you attach the ledger board to the house?
How did you attach the beam to the posts?
How large (dia. and depth) are your concrete footings?