I would rather have black widows and roaches than scorpions. Black widows stay outside and in the garage, in their corners; they do not roam your kitchen floor. Plus, Black widows don't hide in your shoes.
Roaches are easily managed with regular Spectracide.
Anyone who says that a bee sting is the same as a bark scorpion has not been stung by a bark scorpion. Maybe a giant hairy, but not a bark.
To answer the original question:
I have found that scorpions are difficult to kill employing chemical warfare. However, I have heard good things about Cy-kick; I believe I am going to have to try it.
Scorpions are easily dispatched in a face-to-face showdown. The problem is when they get the drop on you. If you spot them first, it is very easy to get them before they get you. Make sure you have a fully functioning black light. I purchased mine at Spencer’s; it is battery operated and runs on 8 AAs. It serves it’s purpose, but it’s time has nearly passed. I just ordered this piece of hardware today:
United Nuclear - Rechargeable UV Light
Don't bother trying to drown them, it doesn't work. Your two key methods of assassination should be either:
1. Compression
2. Heat
My most frequently deployed weapon is the bottom of my shoe. You can liquidate many scorpions quickly with this abundantly common tool, especially if you are light on your feet, or if you are wielding the shoe not on your foot, but with your hands. It is a rather banal approach to scorpion purge, but it is the most effective and simple.
Another of my regularly used compression tools is my "scorpion stick". This is a 2 foot long, 1 inch square piece of wood that I have used to bump off countless scorpions. It is especially useful for scorpions that are high on walls, or wedged in spaces you can't fit the tip of your toe (apply pressure with the corner of the stick, turn vigorously, then drag). I suppose if you are a contortionist, you could step on scorpions high on the wall; I, however, am not that limber. I use the stick.
I have heard of individuals using butane torches to slay scorpions. This is another on my list of tactics to try, but I have never used this technique myself. I have found that a regular butane lighter works alright, but you must be quick. As soon as the flame touches the scorpion, they are off to the races. You must corner them or overwhelm them with flame immediately. Once they reach an impasse, and you can apply continuous direct flame, they cook rather quickly. You know you are done when you hear the crackling of exoskeleton. They will also blacken.
On one occasion, I discovered a hole in the ground frequented by scorpions. Every time I approached, they would scurry into the hole. How to eliminate these scorpions? I simply poured a small amount of rubbing alcohol into the hole, with a short trail leading out, and then ignited the trail. *Poof*, no more scorpions in the hole. Be cautious with the rubbing alcohol system, if you make too liberal an application, you will also eliminate your eyebrows. Also, be advised, this is not a method that would be wise to implement on, say, the side of your house. Very bad things could happen.
Heed my advice. I have killed well over 250 scorpions in the last month.
I don’t really have a problem with scorpions. If my property abutted desert preserve, I would expect to have a few scorpions roam onto my property. I don’t live close to open desert, and my scorpion infestation is out of hand. I am tired of finding them in and around my house.