Delete all clean windows.
EXAMPLE
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0> delwin
All clean windows deleted
0>

CONTEXT
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Presently, the only way to delete specific clean windows is in mapplot.
Delwin provides an alternate way to remove all windows without having
to run mapplot.

RELATED COMMANDS
----------------
mapplot - Allows interactive adding and deletion of clean windows.
addwin  - Allows command line addition of windows.
wwins   - Save CLEAN windows to a text file.