C3510XZ router, how do you flush the ARP cache without a factory reset?

Have a Zyxel C3510XZ router on Quantum Fiber. Everything is running well except I cannot re-use private range IP addresses for days because the router's ARP cache will not release bindings. For example:

I create a VM on my server on a private static IP, for example a SMB server that needs to be on a static. The MAC address on the server's NIC is AA:AA:AA:AA:AA:AA. The router puts this MAC in the table for

After some testing I wipe the server and build a new one at the same IP, MAC address BB:BB:BB:BB:BB:BB. The new machine now cannot communicate with anything outside its local broadcast domain. I look in the router's ARP table through the control panel and see the old MAC in there locked to the IP and no way to change it or flush the cache.

I have asked this question repeatedly to Quantum and their only advice is to reset the router to factory defaults, which is unacceptable as it would destroy all my other settings and I can't just rebuild my configuration every time I need to put a new machine on a previously used static IP. Is there a way to flush the ARP cache or just remove one entry from it? I cannot find anything in the control panel or going through the CLI menus over SSH. Thanks.

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