Preheat oven to 350 and spray a 9x13 pan with baking spray. Cake: Sift together soda and flour Do not skip this step it does make a difference. Mix the sugar , pineapple with juice, buttermilk, eggs , pecans, coconut and vanilla with wooden spoon (no need for mixer) Stir in sifted flour mixture until combined. Poor in prepared pan and bake 25-30 minutes.
Icing Cream all ingredients together and poor over the cake while still warm, refrigerate until cold.