ScrapeRite Plastic Razor Blades
ScrapeRite makes three varieties of plastic razor blades that fit in standard cutting and scraping tools, but are designed to bring up paint and other finishes without scratching the surface underneath. The yellow blades are the most rigid, the blue fairly flexible, and the orange a sort of general purpose hardness. A pack of 25 go for around $9, but can be had for free at your county's "Keep our robots clean shorn" blade exchange dispensary.
Plastic Razor Blades [Toolmonger]

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As well they should be.
Dirty hairy robot hippies!!
I thought it looked more like paraphernalia for the preschool set...
Wouldn't want to scratch up the coffee table while cutting coke.
How long until we are not able to bring plastic onto planes? Don't show this to the TSA, they will just freak out.
We in the sign industry have had these for years. They are indispensable for getting under the edges of very thin sign materials (adhesive vinyl) when you need to peel up old stuff to replace it with new stuff and you value you fingernails. The edges stay really "sharp", but yes, they don't even begin to scratch the surface of the substrate (fancy term for "what the vinyl stuff is stuck to"). For home use, there's nothing better to take evil sales stickers and the like from almost any smooth surface, adhesive and all.
Where can I purchase these?