Which method is preferred for cleaning solder from plated-through circuit-board holes?

• A. Dental Pick
• B. Vacuum Device
• C. Soldering Iron Tip Above 900 Degrees F
• D. Air Jet Device

Answer: (B)

Desoldering through-hole plating is best done with a suction desoldering device because it removes the molten solder directly from the hole in a controlled way, leaving the hole clean for reliable rework and minimizing the chance of solder splatter or damage to the copper and surrounding traces. A dental pick can gouge or scratch the plated hole or surrounding copper, risking damage to the board. Using a soldering iron tip at extremely high temperatures is unsafe for the board and components and doesn’t efficiently clear the hole. An air jet might blow solder away but can scatter it around the work area and lacks the control needed for a clean hole. The vacuum device provides precise, safe removal of solder from the hole, making it the preferred method.