Does anyone know the fancy/technical name for a model railway track cleaner
that's based on flyback pulses from a blocking oscillator to break down
oxide and crud on the rails?

Googling "model railway+track cleaner" produced a few examples of commercial
units but none were referred to by the technical name, I need some schematic
examples to base a similar gadget to clean switch contacts in a 12V system
that occasionally get corroded.

TIA.