This line replaces the values between [ and ] with white space.
:%s/\(\[\).*\(\]\)/\1 \2/g
% - find a replace on every line
s - search and replace
\(\[\) - select the first bracket, can then refer to it with \1
.* - all characters
\(\]\) - select the second bracket, can then refer to it with \2
g - replace all instances on a line
