I scrub my hands weekly with facial scrub. MAC have a great one.
I do it when I’m doing my face, so it takes off the top hard layer, but leaves the callous intact.

They are required for pole, and it is easier if they’re there.

Alternatively, intensively moisturise your hands on non-pole days with a body butter – my rex are Skin Food for the lack of parabens. All natural and really good. lather this on, put on rubber gloves and do the dishes by hand.
At the end, your hands will feel way softer, but you won’t have lost the callous.

The olive oil / salt trick removes the hard, dry top layer. the oil penetrates, giving you quality deep moisture to the lower layers. It won’t remove them callouses, just makes them less noticeable.