Samsung RS21DCNS refridgerator side by side?

We have the above fridge and some milk got spilled into it. All cleaned up no problem but some must have got into the back of the fridge and into the drip tray because it smells awful. We turned it around to find the drip tray which on most fridges is at the back, and there is not one there. There is a small panel behind at the back of the fridge that can be removed but its full of wires etc , and i cant see a drip tray. How can i remove the smell if I cant get into the back of the fridge. thanks