Part 8
Clean and test
A clean, tested part sells faster and comes back less often. Buyers return things that look neglected, and untested electronics lose most of their value.
Cleaning by part type
| Part type | Use | Avoid |
|---|---|---|
| Greasy metal (calipers, brackets, housings) | Degreaser, wire brush or drill wire wheel, then a light protectant | Soaking hydraulic parts; leaving Simple Green on bare aluminum over 10 minutes (Simple Green) |
| Electronics (modules, radios, clusters) | Damp microfiber or alcohol wipe on the case; compressed air and contact cleaner (CRC QD, DeoxIT D5) on pins | Water, pressure washers, flammable non-chlorinated brake cleaner (GRM) |
| Headlights | Restoration kit (about $19–25): sand, polish, then UV-blocking clear coat (GearJunkie) | Skipping the UV coat; it re-yellows. Say "lens restored," never "like new OEM." |
| Textured exterior trim | Trim restorer after an all-purpose clean (Detailed Image) | Using it on smooth plastic or interior vinyl |
| Seats and interior | Vacuum, fabric cleaner, brush with the grain, blot dry (Chemical Guys) | Over-wetting; bagging before fully dry |
| Wheels | A finish-safe wheel cleaner (AutoGuide) | Acid cleaners on machined, polished or powder-coated wheels |
Batch your cleaning: do a whole trip's parts at once to save time.
Testing
- Radios and amps: a regulated 12–13.8V bench power supply (a basic 30A unit runs about $30) and a test speaker. Yellow (constant) and red (accessory) wires to +12V, black to ground; check each function (Sound Certified). Many factory radios need a theft code or the car's network signal to wake up, so a radio that won't power on the bench isn't necessarily bad. Say so.
- Lights: apply 12V to the bulb or harness pins to confirm each function lights, check for moisture inside, and photograph the lit lamp.
- Alternators: check output before a private sale.
- What you can't test, say plainly. Sample wording: "Pulled from a vehicle at a self-service yard. Bench-tested for power-up only. May require programming or VIN coding by a dealer or locksmith; that is the buyer's responsibility. Match the part number before purchase."
Condition honesty. On eBay, "Used" means "fully operational and functions as intended." If you can't confirm that, either explain your testing limits clearly or list it as "For parts or not working" (eBay conditions).
General education, not legal or tax advice. Fees, carrier rates and rules change; check the linked sources before you rely on a number.