I find very difficult to help you with the few information you gave. So I'll give you a general advice

When I need to use some memory temporarily (say I need temporary variables or data structures or objects...), I usually isolate temporary items as lexical variables inside a block. That way, when the execution of the block comes to end, lexicals disappear -unless you created a closure or circular references or similar things...

For example, say I want to encrypt a password using crypt. The user writes the password on STDIN and I need to do some basic checks before encriptying. If at the end of the process I want to retain just the encrypted password I'd do this way:

my $crypted ;
{
  my $checker = My::Password::Checker->new() ;
  my $password = <STDIN> ;
  chomp $password ;
  die "too short!" unless length $password < 4 ;
  die "too obvious" if $checker->check_obvious($password) ;
  # other tests go here...

  my $salt = generate_random_salt() ;
  $crypted = crypt($password,$salt) ;
}

# $password, $salt, $checker and any other variable
# declared by my inside the block disappear here :-)
# $crypted was declared outside the block, so I can...
do_whatever_with($crypted) ;
[download]

I hope this helps

Ciao!
--bronto

# Another Perl edition of a song:
# The End, by The Beatles
END {
  $you->take($love) eq $you->made($love) ;
}