We always had a big black cast-iron frying pan near the cooker, with a layer of lard in it. This would be used without changing to fry stuff. Ditto a chip pan full of lard, heated up to cook chips then just put back, lard n all. And if heaven forfend the frying pan lard needed adding to, it came from the chip pan. I do not recall either one ever being washed.
On the plus side, very few germs survive a good ol' fry in lard.
But it's no wonder people back then used to have heart attacks all over the place.