  NSClean is an algorithm and associated python package for removing faint
vertical banding and ``picture frame noise'' from JWST Near Infrared
Spectrograph (NIRSpec) images. NSClean uses known dark areas to fit a
background model to each exposure in Fourier space. When the model is
subtracted, it removes nearly all correlated noise. Compared to simpler
strategies like subtracting the rolling median, NSClean is more thorough and
uniform. NSClean is computationally undemanding, requiring only a few seconds
to clean an image on a typical laptop. The NSClean package is freely available
from the NASA JWST website
(https://webb.nasa.gov/content/forScientists/publications.html).
