Very glad to hear that the drain is now all clear and you didn't have to lie on your back under a sink (it really gives you a crick in the neck). I didn't realize you hadn't used a plunger first since I'd use it before pouring down chemicals. I use the soda bicarbonate that has been used to deodorize the fridge, shaking down half a box and then pouring in vinegar. It fizzes its way down the drain which is fun to watch. I don't know how truly effective it is but I can't remember the last time I had a blocked drain. I'm sure bleach is the most effective but I really dislike the smell.