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My husband writes the following: I’m a Masgiach who does a lot of kashering and has had a lot of shimush by Dayonim in the city that I live. To kasher counters do the following: 1-Make them treif by dripping hot fleishig liquid on the milky side and drip hot milk on the fleishig side (a drop is enough) 2- Clean the counters that there will not be a “Chatzitza”. 3 Wait 24 Hours 4: Have ready a hot electric iron and a boiling kettle.Pour some water from the kettle (Does not have to boil while pouring)onto the counter and push it along with the hot iron. The iron will push boiling water all over the counter.Add water to the counter when the iron has boiled out the first water. DO NOT LET THE IRON REST ON THE COUNTER KEEP IT MOVING WITH THE WATER, OTHERWISE IT WILL BURN THE COUNTER. Hatzlocho