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i use a dryslope specific wax which is dryslope/arctic (-21c) wax and scrape and find that you have to wax every 10 hours on them otherwise you get base burn, but i generally always scrape. its not going to make much difference if you do or dont as the wax you put on and dont scrape is going to be across the first 100m of dendex/snowflex anyway. the race guys on race day will wax and brush their pairs and will get the lift up on another pair and do course inspection on them and then hop on the waxed pair in the gates as the wax only really has an effect for one run.