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The best way I've found is a 99cent razor scraper. I try and dry it off good when done but still it needs a new blade usually. I'm just very careful around the corners, and I leave it on the back cause it looks cool.
I use a stainless steel one from Kent I think? All I have to do is run it under freshwater for a sec when I'm done and it won't rust. It has a long handle so I don't have to get my hands and arms in the water at all.
I use the Kent scraper as well. It works pretty good, but hard to apply enough pressure to get some of the spots near the bottom. I like it though because of the long handle and don't have to put my arm in the tank to scrape off the glass.