@sanfiat - i called the Jopasu area manager before purchasing the product...and he suggested do not ever wash it as it is pre wax treated cotton strands. Even I have Jopasu since 6 months. It was white cotton when it was new; now it turned black. You can just vacuum clean it if it gets too dirty thats all. Regarding waxing - I wax every month and it is very effective and prevents from settling dust and moisture and bugs. @sungoa - even i apply wax on windshield and headlamp glasses. Instead of applying the wax directly to the windshield (and I dont recommend direct application), I simply use the same cloth that I buff out the wax with to dry and buff out the windshield. This Carnauba wax will not last long on glasses but very effective in bangalore - good to keep off rain water.