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package Cleaner;
sub new 
...
$foo = "\t\tFOO\t\t";
$c->clean($foo);
print $foo, "\n";

package main;
$c = new Cleaner;
...
    'blessed' => sub { my $bar = $foo; $c->clean($bar) },
    'normal'  => sub { my $bar = $foo; $bar =~ s/^\s+|\s$//g },
});

Benchmark: timing 1000000 iterations of blessed, normal...
   blessed: 43 wallclock secs (36.50 usr +  0.14 sys = 36.64 CPU)
    normal: 28 wallclock secs (24.19 usr +  0.08 sys = 24.27 CPU)