Answer
For copper pipe cleaning, sand lightly with 220, 320, or 400, then wipe away dust.
Why it happens
Oxidation and residue can prevent a clean surface. Light abrasion exposes clean copper.
Recommended grit
Use 220, 320, or 400 for light copper cleaning before soldering.
Wet or dry
Dry.
Success check
The copper is bright, clean, and free of loose residue.
What to do
- Clean the copper pipe end.
- Sand lightly around the pipe with 220, 320, or 400.
- Wipe away copper dust.
- Proceed with the proper soldering prep process.
Avoid: Do not remove excessive copper material or leave abrasive dust behind.