As someone with a bit of experience in these things, I strongly reccomend against using any sort of motor based polisher etc. Use your own hands to polish ur car. Do not use anyother methods as they would cause premature wear and tear on your car, not to mention that if used improperly, they can also cause scratches ..
brotherly advice.
To keep ur car in "as new" condition , wash it every week or every other week and dry it ONLY when u r sure that there is no grit, dirt, sand on the paint otherwise drying the car (even with a towel) would cause scratches.
remember a painted surface is fragile and it DOES NOT take a whole lot to cause damage