I washed all four dogs in our bath tub...more than once. Well, it finally was clogged beyond clogged. It took three days to drain completely and it left behind a film of slime and hair. It was so nasty. The picture below doesn't show the nastiness very well...which is good because it would be very embarrassing.
If you know me, you know I dislike chemicals and avoid them whenever possible. I found a recipe online for drain cleaner. It's super simple. You pour a 1/4 cup of baking soda down the drain, then follow that (slowly) by 1/4 cup white vinegar.
It was so bad at first that the baking soda had nowhere to go! I did that a few times. It broke down the clog enough that I was able to actually get some of it out. I did the baking soda thing one more time. (Now that's a more embarrassing picture.) It foams up a lot!
Then, I followed that with a pot of boiling water. It drained immediately! I never had that good of a success with Draino! They say that if you do that once a month, you shouldn't ever get clogs again...with my long hair and the dog's fur, I really need to do that!