See how you can solve your problem if you don't want to use the special products on the market. * Put a cup of baking soda along with a cup of salt into the drain hole and immediately pour enough boiling water down the pipe. * Alternatively, use half a cup of baking soda and half a cup of white vinegar. The union will burn everything,what is stuck to the walls and if you add some lemon juice at the end, annoying odors will also disappear.* Of course, depending on the case, there is also the old well-known practice of... suction cup, which is good to have at home just in case. And it's unnecessary…