I see there's a product called lenspen, one made by lenspen and one made by Hama. it looks nifty. Will that be all I need, along with a hurricane blower? Also, these lenspens come with a soft brush at one end to wipe away loose particles. I thought you were only supposed to use a blower for loose particles to avoid scratching, so why would anyone use the brush which could wipe abrasive particles across the glass? Anyway, if I get a lenspen, does that mean I won't need to use a microfibre cloth and lens cleaning fluid?