Yes, it's acidic so a good idea to neutralise it - it may be too late to avoid paintwork damage though if it's been there a whileUse baking soda in the eater to neutralize the acid in it, lots of car soap and never washing up liq.
I'd try clothes washing liquid works well in a cassette toilet
He does, big blonds only.Do you let birds in to poo in your cassette toilet?!