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Removing Liquified Plastic Layer Residue From Notched Metal Surface

I use old electric hob (as shown in the picture) for preparing my food, which takes a while to heat up and then takes even more time to cool down after use. Today I made a grave rookie mistake - as ...
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Cleaning hydrochloric acid stains from metal

I used hydrochloric acid to remove calcium deposits from a pot, but left some of the acid on the kitchen sink metal plate overnight. It produced corrosion stains like on the photo, that can't be ...