Bottle Stuck In Toilet Plastic Cap Of Bottle Stuck In Water Drain Pipe?

Plastic cap of bottle stuck in water drain pipe? - bottle stuck in toilet

I clean my bathroom sink and today opened the half of the plastic U-shaped bottom of the sink. This horizontal metal tube that is connected to the U-shaped pipe below. I have tried a little bleach in the metal pipe pushing hard and I realized that the shape of the cap of the bottle used bleach. The pipe is hidden behind the cockpit and inaccessible. I tried to find cover in the tube, but it seems fallen further.
All ideas for the thing made of plastic pipe? I use a vacuum because of the danger of electricity.