... if you don't want or need to keep your "dirty" array you could modify it in-place ...

noviceuser:   Note that because map aliases via $_ (on which s/// operates by default), the dirty array is already being modified in place:

Win8 Strawberry 5.8.9.5 (32)  Wed 06/16/2021 10:11:33
C:\@Work\Perl\monks
>perl

use strict;
use warnings;

use Test::More tests => 2;
1..2

my @array1 = ('foo', 'bar');
my @array2 = (" foo\n", ',bar,');

my @clean = map { s/[\s,]//mg; $_ } @array2;

is_deeply \@clean,  \@array1, "new, cleaned array";
is_deeply \@array2, \@array1, "dirty array modified in place";

^Z
ok 1 - new, cleaned array
ok 2 - dirty array modified in place
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With Perl version 5.14 and after, one can use the /r modifier with s/// (and tr/// y///) to avoid this modify-in-place behavior when operating on the default $_ alias. See s/// tr/// y/// under Regexp Quote-Like Operators in perlop. (Update: Correction: the tr/// y/// operators are actually discussed in the Quote-Like Operators section of perlop.)