How to choose input filter component value for power supply
To handle the very fastest of spikes, which likely will be what causes failure,
you need some sort of ground plane under the filtering components. 

100 microH inductance (size dependent on current) and 100 microF will produce 1,600 Hertz resonance followed by attenuation.

Place a ONE ohm resistor in series, for near optimal dampening. Size the resistor to handle the current. 

Common-mode chokes may work better.