1. Nylon anti static brushes.
2. Kim wipes or old t-shirts/rags (clean)
3. 91% or 99% IPA (not the syrup beer)
Spray, scrub, and then put down dry wipe/t-shirt/rag and go over again with brush to soak up while still wet.
For the edge connectors, use a fiberglass pen if really bad. If just a...