Cleaning, Testing, and Preparing Items

01

The invisible stage between buying and listing

Sourcing gets discussed constantly and listing gets discussed constantly. The hours in between get discussed almost never, which is why they are consistently left out of the calculations that decide whether a category is worth trading.

That stage does three jobs, and they are worth separating because they have very different returns:

• Cleaning raises the price a buyer will pay, and raises it most on items where dirt is the only thing making them look old.
• Testing changes what you are allowed to claim, and moves the listing between three quite different price bands.
• Repair changes what the item is. It occasionally pays and it frequently does not.

02

Cleaning: the highest-return work you will do

Per minute spent, nothing else in the whole process moves the price as reliably. A buyer looking at a photograph cannot assess quality independently of presentation, so surface dirt reads as wear, and wear reads as a lower grade.

A general order of operations that transfers across most categories:

1. Least aggressive method first Start with the least aggressive method that could possibly work — dry, then damp, then anything chemical. You can always escalate; you cannot go back.
2. Test on a hidden area Test any product on a hidden area first, and wait. Some damage appears minutes later.
3. Handle what photographs Handle the parts that photograph: screens, glass, lids, spines, faces. Buyers judge from the shot list, not from an inspection.
4. Remove stickers and residue Remove other people's traces — price stickers, adhesive residue, previous owners' labels — which read as neglect more strongly than genuine wear does.
5. Dry completely before storing Let everything dry completely before it is photographed, bagged, or stored. Trapped moisture ruins more stock than any other single handling mistake.

The presentation payoff is covered in the photography guide, and it compounds: the same lighting setup makes a clean item look excellent and a dirty one look worse than it is.

03

The cleaning you must not do

This is the part that costs people money, and it costs them permanently. In several categories, cleaning is value destruction that cannot be reversed.

• Anything where surface age is part of the value. Patina on metals, original finish on furniture and instruments, oxidation on coins. Collectors pay for the original surface and can tell when it has gone.
• Paper and print. Attempting to remove foxing, tape, or writing typically produces a worse defect than the one you started with, and it is visible to anyone who knows the category.
• Original packaging and labels. Grubby original stickers usually beat clean absent ones.
• Anything sealed or graded. Opening or reprocessing it destroys the thing being priced.
• Anything you cannot identify. If you do not know what the finish is, you cannot know what will strip it.

The rule that covers all of these: when the value comes from age, authenticity, or originality rather than from usability, the correct amount of cleaning is usually none. A collector will forgive dust. They will not forgive a polished surface. When you are unsure, photograph it as found, ask the category — and remember that this decision interacts directly with the honesty standard in the condition grading guide: a cleaned item still has to be described as cleaned where that matters.

04

Testing changes what you are selling

For anything mechanical, electrical, or complete-in-a-box, the same physical object is three different listings at three different prices depending on what you know about it.

The practical instruction is simply to spend the few minutes. Keep the common power supplies, batteries, cables, and adaptors for your categories in one box near where you work; check completeness against what the item is supposed to include; and count anything countable — discs, pieces, keys, cards — because "complete" is a claim.

When testing is genuinely impossible, describe the boundary precisely rather than hiding behind one word. "Powers on, display works, I have no media to test the drive" tells a buyer what they are taking on. "Untested" tells them nothing and invites them to assume the worst, then dispute it anyway.

05

When a repair is worth doing

Repair is where sellers lose the most time for the least return, because the appeal is emotional — the item is nearly good — and the arithmetic is rarely done.

Four tests, and it should pass all of them:

1. The uplift is known, not assumed. Sold data for the working version against sold data for the faulty one, using the method in the valuation guide. If you cannot find both, you do not know the uplift.
2. The gap covers parts, your time at your own hourly figure, and the delay before the capital comes back.
3. You can do it repeatably. A repair you have done thirty times is a process; a repair you are attempting once is a research project with your money in it.
4. You are comfortable with what it implies. A serviced item carries an expectation a described-as-faulty item does not, and that expectation is what a claim is measured against.

Two things almost always pass anyway and are barely repairs at all: replacing a missing standard part that is cheap and available, and exercising a mechanism that is merely stiff from storage. Two things almost always fail: anything requiring a part you have to source individually, and anything where the failure has not been diagnosed. "It probably just needs" is the phrase that precedes most of the losses in this section.

The honourable alternative to repairing is describing. A clearly documented faulty item sells quickly to somebody who wanted a project, and it is the outcome with the least dispute risk attached to it. Some of the strongest listings in this trade are the ones that say plainly what is wrong.

06

Doing it in batches, and recording it

Preparation obeys the same logic as every other repeated task: batch it by activity rather than doing all stages to one item at a time. Clean twenty things, then test twenty things. Setup and mental switching cost is most of the overhead — the argument is made in full in the throughput guide.

• Keep a prep area that stays set up, with the cloths, the products, the power supplies, and the bin all within reach.
• Give each item its identifier before preparation, not after, so notes and test results attach to the right unit. This is what the SKU guide is for.
• Write down what you found while you have it in your hand. The flaw you noticed during cleaning is the flaw the description needs, and you will not remember it in three weeks.
• Record materials as a cost. Consumables belong in the item cost model in the COGS guide, and left out they quietly overstate every margin you calculate.

The last habit is the one that pays twice. Notes taken during preparation are what make an accurate description cheap to write later, and an accurate description is the single largest lever on the return rate.