This is my third Cali duster.  Be sure you follow the instruction when you open the duster DO NOT JUST OPEN AND USE.  It will leave smears of wax all over your car and windows.  Follow the instructions - take it out of the bag and lay it duster down on some old newspaper for 48 hours.  The paper will absorb the excess wax that the fibers are impregnanted with.  Even then the first few uses might result in smears -DO NOT PANIC the smears wipe right off.  After a few uses the duster is amazing and will reduce the amount of times you need to wash the car.