the easiest way is to run a cron job to clean up the log file every night. here is the script i use.

#!/usr/bin/perl -w

# remove annonying x90 probe

use strict;

my $log = "access_log";

open F,$log or die $!;
open W,">tmp.log" or die $!;


while (<F>) {
    unless (/(x90|cmd\.exe|root\.exe|default\.ida)/) {
        print W $_;
    }
}
close F;
close W;
rename "tmp.log",$log;
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