Review on Highly Efficient Large Sal Ammoniac Tinning Block - Expert-Grade Solution for Exceptional Results by Mike Goodwin

What can I say? It's a piece of ammonium chloride, it weighs about half a pound, it will tin your soldering iron tip when it stops getting wet. Anyone who says it doesn't work must have done it wrong. To be clear, this is not a substitute for regular handpiece maintenance. You still clean it with a standard brass Q-tip and a damp sponge as needed. You will still tin the tip with solder if you don't use it for a few minutes. However, sometimes your tip gets dirty and/or builds up oxidation. The solder sticks together and doesn't wet the tip properly. That's when you squeeze out the ammonia. Put some melted, clotted solder on the tip and then just stick it into the block. Rub it back and forth, twist clockwise, counterclockwise. You will see a lot of smoke and very soon you will see the solder flowing over the tip as if it were new. At this point I will give the tip a good clean with a brass pad and then apply some solder again. Then admire how it gets wet like new. Oh yes, it's beautiful.