Limescale at the *top* of the toilet bowl

[StrugglingAlong75]

How would you get rid of limescale marks at the top of the toilet bowl? Citric acid works for the bottom, but I can't get it to stay on the vertical surfaces of the toilet pan. I'm looking for something natural-ish, not toxic chemicals.

Have you tried using a wet pumice stone?

Ooh, thanks - that would never have occurred to me!

When I lived in a hard water area I used "Homepro Lift-Off Scale/Stain Remover" bright pink and quite thick so it doesn't run down the bowl. The only current listing I can see for it is https://www.bathroomspareparts.co.uk/homepro-lift-off-scalestain-remover-250ml-lo250ml-8494-p.asp