There's simply no reason to scrap circuit boards when they have contacts contaminated with solder. Restore them using the Gold Contact Plating Kit. Video
Circuit board repair is a challenge. So when the inevitable first-aid is needed, you should provide your operators with time-tested instruments designed and built for the job.
The tools and materials in CircuitMedic kits have been used for decades by the most demanding commercial, medical and military electronics manufacturers and have been specifically designed to meet the requirements outlined in repair and rework guidelines published by IPC, the leading electronics manufacturing industry association.