Something I have heard time and time again from crazy old European Ski Technicians that maybe have been breathing to much High Fluoro fumes is that "The colder the wax, the less you scrape,"
When I first heard this I thought it was a waste of time and too hard. but after one Ski Technician sat me down and explained it to me, it all made sense.
Colder waxers such as Swix CH6 and Holmenkol Ultra mix are much harder compounds to protect the base from the high levels of friction that comes with colder snow, usually coloured blue or green. With this harder compound of wax you'll find that when you are scraping your ski chunks of wax will chip off the base. This is not ideal, this chipping can cause the wax to be pulled out of the structure of the ski base.
So instead of scraping the wax off straight away just scrape tip and tail, then use a steel or copper bush to remove the rest of the wax. this can be a lengthly process but I have found that it is all worth it. If you are using this technique with High Fluoro racing wax (eg. Swix BW or Toko HF) I would advise using a mask as you will be putting a lot of wax into the air. Not the best for your lungs.
Since I started limiting my scraping my skis have been looking healthier, the structure has kept its shape and depth and most importantly my skis have become quicker.