Iceman, I renovated a house with adobe red-clay brick walls. These bricks were 120 years old and had been hand molded and sun dried then built into walls with a lime render. We had to grind part of the wall away and we were covered in a red viscous dust. The walls and the fine powder dust from the bricks were completely dry but it clung like crazy. You could not wipe it off with a dry cloth, it just smears. The texture and colour of this dust looks exactly the same, so does the way it sticks to the fabric it comes in contact with. It also looks wet on a dry fabric, its has an oily consistancy and looks wet like the areas you are showing, but it was completely dry. It would be terrible to be a housecleaner on Mars !
Science now believes liquid water can survive for short periods on the Martian surface if conditions are right, but I think the analogy Chandre posts is closer to the truth, if you look at the moon landings, we see that astronauts clothing, boots and equipment where covered in dust (static plays its part in dust adhering), and the same is true for Mars.
There are signs of recent running liquids on the Martian surface, and as we have seen from rover tracks and other images some soils still look damp, if my memory is right there frost in the landing area, if so the balloons impact could of melted the frost which adhered to the nylon so it is possible that iceman's theory is real.
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Iceman, I renovated a house with adobe red-clay brick walls. These bricks were 120 years old and had been hand molded and sun dried then built into walls with a lime render. We had to grind part of the wall away and we were covered in a red viscous dust. The walls and the fine powder dust from the bricks were completely dry but it clung like crazy. You could not wipe it off with a dry cloth, it just smears. The texture and colour of this dust looks exactly the same, so does the way it sticks to the fabric it comes in contact with. It also looks wet on a dry fabric, its has an oily consistancy and looks wet like the areas you are showing, but it was completely dry. It would be terrible to be a housecleaner on Mars !