Clearing the arp file

I just replaced two servers which were behind the CSS LAN with two brand new ones. The old servers were never actually in use, but services and content rules were created.
I entered the same private IP addresses for the new servers, 192.168.1.11 and *.12, but the CSS and the servers can't see each other, and when I look in the ARP table, I see that both IP addresses has the MAC addresses of the old servers which I assume is why (the servers can see any other server on the CSS LAN).
I can't get rid of them by typing clear arp cache <ip address>, and I see that these entries are also in the arp file.
The CSS has been rebooted in the meantime and it's actually close to two months ago since I disconnected the old servers from the network, so I cannot figure out why these entries stay.
Question is, will clear arp file get rid of these entries? If I clear the arp file (as far as I can see from the documentation I can't clear single entries in the arp file), will this disturb connectivity and services to other boxes?

Erm, okay, why do I get this response, then:
PROD2-CSS-B# sh arp file
192.168.1.7
192.168.1.13
192.168.1.5
192.168.1.9
192.168.1.6
192.168.1.14
192.168.1.8
172.255.7.253
192.168.1.10
192.168.1.11
192.168.1.12
And why does it in the Cisco Content Services Switch
Routing and Bridging Configuration Guide (7.40) in chapter 4.5 say among several things this:
"Updating ARP Parameters
To update the file containing hosts reachable through ARP, use the update arp command. This command is available only in SuperUser mode.
For example:
# update arp file"

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import java.io.*;
/** File structure is as follows. 1st four bytes (int) with number of live records. Followed by records.
<p>Records are structured as follows<ul>
<li>Alive or dead - int
<li>Length of data - int
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add cherryRecord added
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1       orange
2       cherry
3       pineapple
delete 5Record 5 does not exist
delete 1Record deleted
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