Our shower is notorious for clogging and so my spouse went and purchased Liquid-Plumr in order to fix our shower from turning in to a bath every time we bathe.
The first use did nothing, and so we figured we must not have done it correctly. We tried again, and although there was a little improvement, it wasn't enough for us to actually say the drain was unclogged. Felt like a waste of money and wasn't even close to as effective as it claims to be.

We have had a clogged drain a few times and my boyfriends first reaction is to go out and buy this very expensive liquid plumbr. I don't find that this works as good as it claims and I think it's a waste of money. I use a foaming bleach cleaner instead, let it slower coat the drain and this has worked better than anything else I've tried.