After filtering the tea leaves with the hot tea water, add some white granulated sugar, mix it well, drop some detergent, and then let it cool down. After half a day, blow it again. The safe formula is non-toxic and harmless, and the proportion is moderate. This water is very good for blowing bubbles, because white granulated sugar can increase the tension of bubbles, so bubbles can be blown very large, and the stimulation to babies will be smaller.