If you have previously recommended this thread, you should see a tick / check mark on the recommend button. Click the tick to undo the recommendation (the tick may appear to change to a cross as you do this.) If you added a comment with your recommendation, you will need to delete that from your facebook wall separately.
I saw the thread title and had to recommend Lash Power, but I see I've been beaten to it! It's seriously good stuff, also means no need for eye makeup remover. I take mine off in the shower, wash hair, rinse, rub eyes, sorted! I would say that if you try it, you can't 'layer' it like you can with other mascaras because it goes clumpy, so make the first swipe a good one!