Re: Cleaning brass etc
Most of the muck is probably of a biological nature or oxidation of the brass so the Persil soap will remove the grime, and the soda acts as an agitator.
I have used Cillit Bang on raw brass, no hot water or soda needed, I don't know how it would work on other metals. And it shouldn't be used on plated surfaces, which could include silver.
Geof
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