This post is for anyone living in cold climate and, whoever do not have to deal with snow and ice, see next post and please do not give your opinion on something you don't know. It's pretty technical so we'll keep this discussion for those concerned.

For this difficult sharpening, I propose the following procedure using a block plane.

- Close the mouth as much as you can to prevent tear-outs.
- Use your finest stone to sharpen your blade. You can use the ruler trick and a secondary bevel is a must.
- Those using a regular 45° bedded plane can also use the chip breaker effect.
- Clamp your ice scraper in your vice.
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- A scraper should be sharpened at ~45°. Any deviation from that angle on the low side will get you an edge that won't last. If you end up on the high side, the scraper will be very difficult to push. So, 45 is an important angle in the geometry of a scraper.
- Using your plane, start slowly and be careful not to plane a rounded edge. The use of a straight edge to verify your progress is a must.
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- Have a look at your shavings. They should be almost translucent.
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Your scraper surface finish has to be very smooth otherwise you will scratch your windshield.
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Normand
PS: George and Patrick, there is no snow in your areas. Please don't interfere with my post. Same comment for those guys in Oz.