Oranges and lemons are usually sprayed with some chemicals to preserve
them. This stuff should not be eaten. But some recipes ask for lemon
or orange zest. I have trouble to find unsprayed oranges in the shop.
But someone told me that it suffices to simply wash the fruits with
warm water and a drop of detergent. Would anyone know if this is true,
or if there is more one should know about?

Fkoe