Replying to Best Wax For POW Skis

To anyone that can recommend some good wax for powder skis that would be much appreciated. I have done some research on google but haven't come to any conclusions just a general consensus that most waxes are uniform for every kind of ski it is just dependent on the type and degree of snow your skiing. If so I will be skiing in Japan for much of the season. Also what is the best way to clean previous wax and gunk from your skis and would it at all help to use some P Tex on surface scratches. +Karma to anyone who can help.