this post was submitted on 23 Feb 2025
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My girlfriend bought a cafe and they had a cast iron waffle iron that had, in some places, 5mm of grime built up over 2 years, never once been cleaned. Even the hinges were full of old crusted on batter and grease.

I spent hours with a grill scraper scraping every individual pin.

I have gotten to or past the seasoning in many places except in between all of the pins is hell to try to scrape the old baked on grease away. I have tried sodium carbonate soaks, a wire brush and a wire brush on a drill, a few different scraping tools, and I have only gotten about half out of those grooves. Miles better than before, but still not perfect enough to season and put back in the cafe.

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[–] litchralee 6 points 1 week ago* (last edited 1 week ago)

Going from the information from a plastics compatibility chart I found online, a number of common plastics have excellent durability against sodium hydroxide (aka soda lye), such as polyethylene (PE) and polypropylene (PP). When I restored my cast iron pan a few months ago, I used a lye-based oven cleaner sprayed into the pan and placed it into a plastic garbage bag made of low-density polyethylene (LDPE). The bag itself did not dissolve.

That said, my understanding of plastics compatibility is that test is whether a chemical will not degrade the useful properties of the plastic. So a non-compatible plastic might not be visibly damaged but could incur changes in its chemical structure that embrittled or otherwise reduced its lifespan. I was working with a solid cast iron pan, so unless you know exactly what plastic the waffle iron parts are made of, the point to be careful with plastic handles or cords is well-taken.

That said, when using lye, think it would be far preferable to remove the iron component from the waffle iron and then follow the same procedure as many cast iron pan users have done, for the same successful result.

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