How to fix drainage clog in the shower?
The problem with all liquid drain cleaners is contact time; they need time to dissolve the clot materials, but if there is even a small amount of flow, they drain away and thus stop working. A good snaking job is much much better. If you were using the typical sink snake that is long and thin, try renting the type that is a long flexible spiral steel spring with a way to rotate it. Rotating it is how you get down past the trap. Also as you do it, pull it out every few feet and look at the material on the end to make sure it is getting something. If it is primarily hair, get a good hair trap for the drain to prevent it from going down there in the future.