Honestly if you want the best results and performance for tuning your skis, dont do it yourself and take it to well respected ski shop. I can vouche for myslef because tuning my skis now that i work at a ski co. it is so much more technical than what i did at home.
Base & Side Edge- An eding machine will do the job perfectly (if your have $5,000). The machine levels out any obstrusive bending or movement in your edges. They not only remove rust build up, but sharpen your edges so they slice, and yes ,melt the snow. Edging can be done at varying degrees based off of personal requisites, brand, and model skis
Belt Grind- If you have $70,000 to spare, why not buy a Wintersteiger ski and board tuning machine! The belt portion of the machine is done first. It essentially removes any obstructive material that has built up in the base over a period of time. Note: not dirt or grass or any temporary substance. but particles that have snuggled themselves into the base.
Stone Grind- The stone grinder, note we're not grinding your bases with a stone. but in fact we're cutting a pattern into the base of the ski that not only smooths the base, but creates a structure within the base that deviates the temporary water that is beneath your base and essentially creates a weak form of thrust for your ski.
De-Tuning- Sometimes, the tune we created for most skiers and boarders is making the equipment too fast for them to control. So you should de-tune your ski with a file along end of the skis running length when it is in contact with snow. only do this with a couple clean strokes. you can also de-tune under under binders if you want to slide well in the park. Also use a gumi-stone for any fine tuning along any edge or just to get rid of missed rust build up
How Wax- DO NOT, use a clothing iron, or any wax you can get a hold of, and DO NOT heat your bases up before you wax, all you;re doing is burning the base material only to create more friction. Instead use a high quality polycarbonate wax. I prefer Swix or Purl and apply at the recommended temp. Use as little wax as possible, yet completely cover the entire running length of the base. Then use ONE slow, but moving stoke to soak the wax into the pores of the base.
Scraping & Cleaning- You can begin scraping your skis after the wax has been applied. Usually do this once the wax is at room temp. or leave it dry in a few hours. Use a plastic scraper and scrape the wax off, but do not gouge the base because you ruined your tune. Then use a brass brush to remove any excess wax follwed by a a quick roto brush.