I broiled a mackeral on my silpat yesterday night. I washed twice in hot water and dish soap, and even soaked it for half an hour in soapy warm water.
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I'd try soaking it in hot water that's acidulated with lemon juice -- just halve a few lemons and squeeze them in to the water.
Or scrub with a paste made from warm water and baking soda. Allow it to set for ten minutes. That'll do the trick.
My first thought is to use vinegar.
I finally got rid of the smell!
Soaking it with vinegar was not enough. I read online that the silicon molecules in the silpat would expand when warmed and secrete the previously soaked in oils. I first warmed the silpat up in the oven (I baked a sweet potato with it) and, while the silpat was hot, immediately soaked it in warm soapy water and white vinegar. Voila -- smells like new!
I didn't have lemon on hand, but I'm sure it would work similarly to vinegar.
THANK YOU for saving my silpat! I broiled mackerel on my brand new silpat and I was so mad at myself for not thinking about how fishy it would get. Warming the silpat and then soaking it in hot, soapy water with vinegar worked wonders!
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Better living through chemistry!
Thank you so much for asking this question! You solved a problem I didn't know I could solve!
I'm glad this old thread is still useful!
And by the way, "My silpat smells like mackerel," is a drop-dead conversation-stopper! Comedy Central may have you written all over it.
Today I made toasted siracha sunflower seeds and my silpat mat was totally siracha-fied. As mentioned in this thread, I heated my silpat in the oven, then soaked it in hot water and white vinegar - BINGO!!!! The smell is totally gone. Thank you so much for posting this solution - it was a huge help.