How to clean second-hand books

First: triage in the shop, not at home

The best cleaning is the cleaning you avoid. Thirty seconds with a book in the shop saves an evening with it at home:

• Smell the top edge. Old-paper vanilla is fine and fades. Damp cellar must is a warning — it can improve but rarely disappears.
• Look for mould, not just marks. Grey or white fuzz, or clusters of black spots on the page edges, mean spores. Mould spreads to healthy books on your shelf. Leave it.
• Fan the pages. Water ripple, tide marks, and stuck-together pages are permanent. Marginalia is your call — some readers pay extra for a stranger's pencilled opinions.

Price stickers, without the scar

The charity shop sticker is the hobby's great nemesis — peeled cold, it takes the cover lamination with it. The ranked methods:

• Warmth first. A hairdryer on low for ten seconds softens the adhesive; peel slowly from a corner, low and flat, not upward. This alone handles most stickers.
• Residue afterwards: rub gently with a clean eraser, or a cotton pad with a drop of sticker remover or lighter fluid on glossy covers only — test a corner, and never on matte or uncoated paper covers, which drink solvents and stain.
• Stickers on bare paper (title pages, older paperbacks): stop. Accept the sticker. Solvent and scraping both do more damage than the sticker ever will.

The musty smell

Musty is trapped moisture plus time. The realistic fixes, in order of effort:

• Air it out. Stand the book fanned open somewhere dry with moving air for a few days. Sunlight helps the smell but fades the cover — bright shade, not the windowsill.
• The bicarb box. Put the book in a sealed container with an open pot of bicarbonate of soda (not touching the book) for a week or two. Cat litter and activated charcoal work the same way. This fixes most mild cases.
• Accept the limits. A deeply musty book stays faintly musty. If step two barely dents it after a fortnight, the smell is in the binding for good — decide whether you can live with it on the shelf.

Covers, edges, and everyday grime

• Glossy covers: a barely-damp microfibre cloth, then dry immediately. Handles fingerprints, coffee film, and general stickiness.
• Page edges: light surface dirt lifts with a soft dry rubber (a white vinyl eraser), stroking away from the spine. Fine sandpaper is a bookseller's trick that's easy to overdo — skip it.
• Pencil marks: white vinyl eraser, gentle strokes, and patience. Ink and highlighter are permanent — factor that in at the shelf.
• Foxing (those rusty freckles on old pages) is a chemical process, not dirt. It doesn't clean off and it doesn't spread like mould — consider it a birthmark.

Do second-hand books need disinfecting?

Almost never, and never with anything wet. Paper is porous and absorbent, which makes it a poor home for the things you would want to kill and a bad candidate for the sprays and wipes that work on a kitchen counter. Anything wet enough to disinfect a surface is wet enough to cockle the page, lift the print or leave a tidemark you cannot remove.

Time does the same job for free. Leave a charity shop or thrift store find somewhere dry with air around it for a few days and you have achieved what the wipe would have, without the damage. That is most of what the quarantine shelf below is for.

The exception is a laminated or plastic-coated cover, which is most modern hardbacks and almost all children's books. A cloth barely damp with water, wrung out hard and dried off straight away, is safe on those. Alcohol gel lifts ink and dries out leather, and antibacterial spray leaves a residue that attracts dirt. A UV lamp yellows paper and fades the boards.

The quarantine shelf

A habit worth stealing from collectors: new arrivals sit apart from the main shelves until they've been checked, cleaned, and (if needed) de-mustied. A cardboard box by the door does the job. It keeps one bad find from becoming a shelf problem, and it gives you a pleasing little processing ritual — sticker off, wipe down, log it, shelve it.

The logging step is worth keeping too: a quick photo of the new stack in Spines adds everything to your library in one go, so the next time you're standing in a shop wondering do I already own this? — your pocket knows.

Questions people actually ask

How do you clean books from a thrift store? Check it in the shop first, then peel the sticker with warm air rather than a fingernail, air out any mustiness for a week, and wipe only covers that are laminated. Most finds need nothing beyond the sticker and a few days somewhere dry.

How do you sanitize used books? You mostly do not. Leave the book open to dry air for a few days. Wet sanitiser and alcohol do more damage to paper than they are worth, and there is no way to soak a page and keep the page.

Can you use disinfectant wipes on books? Not on paper. On a laminated cover a barely damp cloth does the same job without the residue. A wipe on an uncoated cover will cockle the board and may lift the print.

How do you get the musty smell out of a second-hand book? Air first, for a week, standing on its end with the pages fanned. If that fails, a sealed box with bicarbonate of soda or a charcoal bag beside the book, never touching it. Mould is a different problem: leave those in the shop.

What not to do

• No household cleaners, wipes, or sprays — they're wet, alkaline, and permanent.
• No microwaving, oven-drying, or freezing to kill smells — bindings warp and glues fail. (Freezing has one legitimate use: killing insects, sealed in a bag, for a week.)
• No taping tears “for now.” Ordinary tape yellows and eats paper. Loose pages can live loose; repairs want proper document tape or nothing.