Same here - the scourer I use is one of those stainless steel ones. Doesn't contain any gritty stuff and doesn't seem to scratch the stainless steel of my boiler, yet really cuts through the burn't on stuff.I don't have the grainfather, so I'm not qualified to comment on that piece of kit.
However, I do have a 5 gallon boiler/kettle.
I use a scourer to keep the bottom clean.
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