Foam to clean wc bowl?

[conversant]

Hello!

Is there any foam that I can spray inside the towel bowl and have all the stains removed overnight?

It has to be non dangerous/unhealthy and obviously not to destroy the enamel but it should be strong enough to decompose all the stains!

Thanks!

Have you tried spray limescale remover?

No, I haven't because I am not sure if the stains/dirt are limescale, they are not solidified salts?
Also, any regular liquid spray does not seem to stay on the whole surface of the bowl so that it does not clean well without rubbing. I need to put something, have it stay on the surface for long and act, then just flush to clean the bowl.

I have given up on wonder sprays. I get rubber gloves, a sponge, scrubbing powder (the white powder, whatever it is named in your country) and a pumice stone for the really hard residue.
Wonder sprays that do remove stains also damage the porcelain, if you aren't very careful (ask me how I know... 🙄). Rubber gloves and 10 minutes of scrubbing should take care of the problem, unless the porcelain is damaged and residues collect in these spots. 🚽🧤

I should have said I have found that limescale remover works on non limescale stains ie stubborn stains on toilet seat
Following with interest