Cleaning sink stainless steel (caustic soda?)

[Marland]

Still sounds too similar to pile ointment,

I wonder if some caring wife anxious to help has ever bought or even applied the wrong product.

GH

[bert]

Available from Lakeland.

[Vir Campestris]

It's an abrasive with oxalic acid in it. Works very well.

Andy

[polygonum_on_google]

You could try melamine foam cleaning blocks. They can be very effective - for example, removing tea stains.