Possible Clues:

• Deck treatment
• They make their mark in England, by the sound of it
• This isn't as marked as things are with them
• Treats wood
• Deck covers
• Mark how they ain't mixed in the ship
• Discolorations on satins
• Discolours or dyes wood
• They make their mark near London, by the sound of it
• Sloppy eater's problem