Mine doesn't work either. Do what Wayne recommended, the cut off milk jug and sponge. I use a grout sponge, used for tiling, it holds a ton of water.
If I can balance it I'll open the bailer underway, suck out the water and reseal it.
This is what I use for my cars:
it is variable speed down to 300 rpm. I don't know what product I would recommend. If they are just scuff marks on the bottom of the hull, try an automotive cleaner/wax.
I bought a Sunfish a few weeks ago, that was in great condition for 300 bucks. I picked up a trailer kit at Northern tool for $350.
I just got it all rigged to go and wanted to share it with y'all. I've been lurking on here for a bit deciding which way to go on the trailer, etc. I decided...