1. Buy dirty blade from ebay
http://666kb.com/i/b6ec5bmbx6euwqp7q.jpg
2. Dip in muriatic acid for half an hour and remove
http://666kb.com/i/b6ec61roo2w78j9d2.jpg
3. Sand with sandpaper for 10 mins
http://666kb.com/i/b6ec6qmb9o9yd33mu.jpg
4. Realize you've still got a long way to go!
http://666kb.com/i/b6ec7u0ocglihh4iu.jpg