If you have a dry or wet vacuum, it can be a good tool when it comes to dealing with a blocked sink Archway. You should set the vacuum up to vacuum the liquid. You can then cover up the vent in order to prevent a mess. You have to try your best to create the tightest seal that you are able to do achieve. You have to be creative and adapt the old plunger head for this purpose. When you turn a vacuum to the highest setting, it may be powerful enough to unclog a stubborn clog. Even if it may not work always, you will not lose anything when you try it. If it is the bath drain that was clogged, you may mix up baking soda and vinegar and pour it into the drain and afterwards place a stopper at it. After 60 minutes, you should fill the bathtub with enough water and then you can remove the stopper. The pressure of over 40 gallons is enough to dislodge a blockage that has already been loosened up by the baking soda and vinegar. You may also try a drain snake together with the water. If it is a toilet that has been clogged, you should use dish detergent in the bowl and add some hot water. The dish soap will work as a lubricant and it will help to break the clog. You can then pour hot water into the bath and then plunge. You can also add baking soda and salt into the blocked sink Archway. You should then leave the drain for some minutes and then pour the boiling water down. The baking soda or salt and the boiling water will produce a chemical reaction that can dissolve the nastiest blockage. A drain snake is also a piece of equipment that can work wonders when it comes to blocked drains.