The tools
The drill is an old Bosch 9.6v cordless I have had it for about 15 years and like most of these things the batteries gave up the ghost but the actual drill is still going strong so I put a flex on it and use it directly connected to the boat's battery and so far the extra volts have not had any detrimental effect on the drill motor.
Treadmaster after scrubbing
As can be seen the brush did not affect the paint etc as was to be expected but I found that this could be easily removed by rubbing gently with some 60 grit sandpaper.
After removing paint etc
There are some slightly lighter patches where the paint was sanded, they don't show up in the photograph but I am expecting them to darken down to match the rest with wear and exposure to the atmosphere. In an ideal world I would probably replace the treadmaster with fake teak but it is much improved and will suffice for the time being. Next week I will have to get back to the sanding.