Why should utensils be spotless when making a sponge cake​

Eggs – The eggs are the star of the dish and are what gives the cake its lift and light spongey texture. Flour – Cake flour is preferred but all-purpose flour will work as well. Sugar – The white granulated sugar will add just the right amount of sweetness and aid in the overall texture and browning of the cake

Cleanliness.

nobody would want cake made with dirty,unclean, and unsanitary utensils.that’s just not good.also allergens,if someone is allergic to eggs and the cake batter was stirred using a spoon with egg,that could be life-threatening.please clean your utensils before making sponge cake.please and thank you.hope this helps!

Its the 3rd one i think