Coffee Asked by mxxk on December 2, 2020
After months of use, the metal filter used in my French press coffeemaker now has small traces of coffee grounds stuck between the mesh fibers which cannot be removed by brushing either side. Seeing the advice in How do I effectively clean a metal Chemex filter?, soaked the filter in 5% vinegar for multiple nights, but unfortunately the grounds remained embedded in the mesh.
Before trying alternative methods in the linked post, I wanted to check with folks here to see if any were particularly effective, especially before applying any of them method to clean a metal, cylindrical cold brew filter, which would be more difficult to replace if damaged than the metal mesh of a French press:
Never boil vinegar or even heat it up. At high temperatures, concentrated acetic acid will become corrosive and can burn through metal and rock.
I'm not a chemist, but I'm confident that you won't be able to dissolve coffee dust using conventional cleaning methods. I think the chemical solutions you describe are primarily aimed at dissolving oily residue.
If fine grounds are stuck in the filter, I'd try to remove them mechanically. In this case, I think air pressure from a compressor could push them out.
Answered by JJJ on December 2, 2020
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