Brandt ?

Hi I am having problem with my Brandt Fridge Freezer. I am not sure about the model and make as it came with the house when we bought it in december. It says A- class I think.

We don't have a manual.

I have defrosted the freezer for about 24 hours and its working a bit better but still not freezing adequately. I pulled the freezer out from the wall and noticed that at the at the bottom of the firdge there is a pipe ( black plastic corrogated) and it seems to be emptying into (what was once) a clear plastic container. Is this the drain pipe? That plastic container is full of liquid that I assume has come from this pipe. The liquid looks like very dirty water and is full of dust etc. The container is not covered.

What do I do? Should I get the liquid out?