Sadly, I have lots of experience on this one. I found the easiest way to do it was to glue the various meshes to velcro and then use the aquarium magnets to run the mesh. This is when the tank is full. Start with smallest # grit and work your way up. Don't be alarmed at first. You'll think you just ruined your tank because it will look totally frosted. As the grit gets finer, the frost goes away. Be patient and keep with the sequence (don't skip grits). Also, go in opposite directions with each new grit.
the micro mesh link is a good one.
Good luck.
Del