How to reset plasma5 ?

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How to reset the plasma5 settings to how it was from a fresh install ?

System: Host: linux-90vq Kernel: 4.1.12-1-default x86_64 (64 bit) Desktop: KDE Plasma 5.4.2
Distro: openSUSE Leap 42.1

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See: https://forums.opensuse.org/showthread.php/511266-Plasma-5-frustrations-runnenth-over?p=2739204#post2739204