On solid state machines, I often heard of using dollar bills, credit cards,
quarter rolls, etc. to clean the fragile leaf switches of the solid state
machines. Most of these fixes are temporary and unreliable for long term
service. To clean blade contacts on solid state machines use an ordinary
rubber eraser (usually found in discount stores for about .25), cut the
eraser into about 2 inch long strips about 1/4 inch wide and 1/16
thick. These are approximate sizes, use what helps you best. Rubbing the
contacts with the eraser will clean the contacts like new, a good long term
fix.
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