I have to disagree that this thread is solved. I too would like to see how Planky’s icon could be removed. Using different software doesn’t mean that the problem with this software has gone away. If anyone finds where this settings file is located, I’d love to know!
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It harder to get the proper attention at the bottom of a solved thread 
Better to link to it.
Plank icon can be removed using dconf-editor. Navigate to net.launchpad.plank.docks.dock1. Among settings there is a show-dock-item option, uncheck it to remove icon.
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Thanks guys for your great help!
Now I have back my favorite desktop design! 