You generally don’t. It all depends on your attack hypothesis. Are you a Mossad target or a non-Mossad target? The best you can do if you are a non-Mossad targe

You generally don’t. It all depends on your attack hypothesis. Are you a Mossad target or a non-Mossad target? The best you can do if you are a non-Mossad target is to anonymously/pseudonymously periodically purchase new hardware and do a fresh OS install. Be minimalistic. If you can’t trust your wifi-enabled printer, disable its wifi connectivity and use it only over USB. If you still can’t trust it, don’t use printers to begin with.