I guarantee you when people scratch or leave irremovable scum on the sensor during the cleaning, Nikon will not come to praise you.
It should be noted that no manufacturer recommends or endorses any third party cleaning methods. This represents the potential to do harm to the IR filter, the sensor or the mirror apparatus.
This is due to the simple fact that manufacturers do not want to be held liable for any damages that may occur. More to the point it is because of the posibility of the shutter mechanism closing while cleaning the IR filter, damaging the shutter mechanism and rendering your camera useless.