Normal fermentation of wine, fermentation will see a lot of bubbles between the grapes when the upper layer will be produced, like soap bubbles like white bubbles, no white hair or mold phenomenon, that is normal, do not need to remove. If the birth of white hair, white mold or white film like that is infected with bacteria, need to be removed as soon as possible and sprayed with a high degree of white wine on the upper layer of grapes to prevent further infection.