not always. some times, weak joint or location may leak. snake is the best.马桶搋子 次次见效
you were almost there. the stressed snake needs to find a way to relief. if it cannot "弹出来", the tip turn around the corner to move forward will be its way to go. just manage to not allow it "弹出来".幸运的是厨房下水管道都在外面露着,只是空间狭窄,操作不便。
那个 snake, 转一会儿就弹出来,明显感到顶到头了,试了两个小时也不行。