[Avodah] Why is it necessary to Kasher counters/workbenches for Pesach?

[Meir Rabi]

I dont know any kitchens where hot [or even cold] chamets is put directly
onto the workbench surface.
As often as I have made this observation, the response is that stuff falls
off the platter onto the workbench.

Is that enough to require kashering the benchtop?

-- 

Best,

Meir G. Rabi
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