Tom, from Milwaukee Hacker Space, tested a very fast way to etch your circuit boards: he uses a mix of muriatic acid and high-concentrated (30%) hydrogen peroxide and wipes the copper away with a sponge.
Here’s a video showing the board completely cleaned in few seconds:
[youtube id=”OTGZcY7WyYI” width=”600″ height=”350″]
Please be careful with the acid and work in a well-ventilated area!
Via: Hack a Day