To clean a wooden cutting board, wash it with warm water and dish soap, rinse it, and dry it immediately with a clean towel rather than leaving it wet. Never put a wooden board through a soak or a long dishwasher cycle if the manufacturer hasn't approved it, because water is what warps and splits wood. To go further and sanitize, the University of Maine Cooperative Extension publishes a solution of half a teaspoon of unscented liquid chlorine bleach per quart of clean water, applied evenly, left to sit for one minute, then wiped dry. Because a cutting board is a food surface, rinse it with clean water after any sanitizer.
And on the question everyone actually arrives with: the research does not say plastic is safer than wood. It leans the other way, which is a surprise to most people, and the detail is worth reading before you throw out a board.
This is part of the kitchen deep-clean order on House Tweaks.
First, the never-mix rule
Any time bleach appears in a kitchen article, this has to appear with it.
Never mix bleach with vinegar. Never mix bleach with ammonia or with any cleaner containing it. Both combinations release toxic gas. In practice this bites people who have just descaled something with vinegar, or who use a glass cleaner nearby, and then reach for bleach at the same sink. Rinse everything through with plain water before you switch products, and don't store a mixed solution.
Washing a wooden board: the whole job
The University of Maine Cooperative Extension's guidance for wooden boards is short: "wash the board thoroughly with warm water and a standard dishwashing soap" and "dry the board immediately with a clean towel."
That second half carries more weight than it looks like it does. Wood damage on cutting boards is a moisture story. Boards warp because one face gets wet and the other doesn't, and they crack because they absorb water, swell, and dry unevenly. So:
- Wash both faces, even if you only used one, so the board wets and dries evenly.
- Don't leave it lying flat in a wet sink or standing in a puddle.
- Dry it with a towel, then stand it on edge so air reaches both sides.
Bamboo and solid wood boards are frequently damaged in dishwashers. Maine's bulletin says solid wood boards "may be OK in dishwashers, but some may warp," and that bamboo "may warp or get damaged." If your board came with care instructions, those instructions win over anything here.
Sanitizing, with a dilution I can actually source
There is a lot of confident bleach math on the internet and the numbers do not all agree. Different authorities publish different concentrations, and some sites publish figures with no attribution at all. Since this is food safety, I'm only going to give you a dilution I could verify at its source.
University of Maine Cooperative Extension, Bulletin #3108: a solution of half a teaspoon of unscented liquid chlorine bleach per quart of clean water, which the bulletin describes as delivering approximately 50 to 200 ppm of available chlorine. "Apply the solution evenly by spraying or wiping. Allow it to sit for 1 minute, then wipe dry."
Three practical notes on top of that:
- Unscented, plain chlorine bleach only. Scented, splash-less, and cleaner-added bleaches are different products and are not intended for sanitizing food surfaces.
- Rinse the board with clean water afterward, because it's a surface food touches directly.
- Bleach concentration in the bottle varies by product, which is one honest reason published dilutions differ. If your bleach bottle carries its own food-contact sanitizing instructions, follow those, because they're written for that specific product's strength.
If you'd rather not use bleach at all, washing thoroughly with hot soapy water and drying immediately is the baseline every authority agrees on, and it's the step that does most of the work. Sanitizing is an addition to washing, never a replacement for it.
Wood vs plastic: what the research actually found
This is the part the kitchen-lore version of the internet gets backwards in both directions, so it's worth being precise about who found what.
Dean O. Cliver, a food microbiologist at the University of California, Davis, spent years on this question. His review "Cutting boards in Salmonella cross-contamination," published in the Journal of AOAC International in 2006, summarizes it. The core observations:
- Wood is porous, so juices and bacteria are drawn into the body of the board. Cliver's finding was that once bacteria enter the wood, they do not come back out, and their return to the surface via knife contact has not been demonstrated.
- Plastic scars. Cliver notes that "knife-scarred plastic indicates that the surface is very difficult to clean and disinfect," and that high-density polyethylene can delaminate under knife scarring. A new plastic board is easy to clean. A heavily used one is not the same object.
- The epidemiology is the surprising part. Cliver reports that two studies found cutting board cleaning habits had little influence on the incidence of sporadic salmonellosis, and that one found use of plastic cutting boards in home kitchens was hazardous while use of wooden boards was not.
What that does and does not mean, stated carefully:
It does mean the popular claim that plastic is the food-safe choice and wood is the risky one is not supported by this body of work. If you have a wooden board you like, the research is not a reason to bin it.
It does not mean wood is self-sterilizing or that you can skip washing. Nothing in Cliver's work says that. Wash the board either way.
It does mean the condition of your board matters more than the material. Maine's bulletin puts the practical rule plainly: boards with deep grooves, cracks, or excessive wear "should be replaced when they can no longer be cleaned effectively." A gouged plastic board and a split wooden board are both past it.
| Wood | Plastic | |
|---|---|---|
| Cleaning | Wash with hot soapy water, dry immediately | Wash with hot soapy water; often dishwasher safe |
| Dishwasher | Often not advised; may warp or split | Usually yes, check the board |
| Knife damage | Cuts close somewhat; surface stays workable longer | Knife scars are permanent and hard to clean |
| Kind to knife edges | More forgiving | Depends on the plastic; hard boards dull edges |
| Replace when | Cracked, split, deeply grooved, or unglued | Deeply scarred or delaminating |
The habit that outperforms the material choice
If you only change one thing after reading this, make it this one, because it's the practice food safety authorities consistently emphasize: use separate boards for raw meat, poultry, and seafood, and for ready-to-eat food. Maine's bulletin states it directly, recommending one board for raw animal products and another for ready-to-eat foods.
That single habit removes the cross-contamination path entirely, which is worth more than any amount of arguing about porosity. Color-coded or differently shaped boards make it easy to keep straight when you're in a hurry, which is when this actually breaks down.
The same applies to the knife and to the counter around the board. If you cut raw chicken, the knife, the board, and the surface all need washing before anything else touches them.
Oiling a wooden board, and what it does not do
Food-grade mineral oil, or a board cream, keeps a wooden board from drying out and reduces cracking. That's a maintenance job, not a hygiene one. Oil is not a sanitizer and it doesn't seal a board against bacteria in any meaningful way.
Use an oil sold for the purpose. Cooking oils such as olive or vegetable oil go rancid over time and will make the board smell.
What I can't tell you
I can't tell you your board is safe. Nobody writing an article can, because that depends on its condition, how it's been stored, and what habits it's used with. What I can do is point you to the two authorities I checked directly, tell you where they disagree with popular advice, and refuse to invent a number where I couldn't find one.
If you want to build board care into a routine rather than a panic, it fits naturally into the kitchen cleaning schedule, and the wider deep-clean order covers where it sits relative to everything else.
FAQ
Is soap enough after cutting raw chicken on a wooden board? Washing thoroughly with hot water and dish soap, then drying immediately, is the baseline every authority recommends. If you want to go further, sanitize afterward using a dilution from a named source, then rinse with clean water. The stronger habit is using a separate board for raw meat in the first place.
What bleach dilution should I use on a cutting board? The University of Maine Cooperative Extension publishes half a teaspoon of unscented liquid chlorine bleach per quart of clean water, applied evenly, left one minute, then wiped dry. Rinse the board with clean water afterward. If your bleach bottle carries its own food-contact instructions, follow those, since product strengths differ.
Are wooden cutting boards less sanitary than plastic? The research does not support that. Dean Cliver's 2006 review in the Journal of AOAC International reports that knife-scarred plastic is very difficult to clean and disinfect, and cites a study finding plastic boards in home kitchens hazardous while wooden ones were not. Both still need washing.
Can I put a wooden cutting board in the dishwasher? Usually not advisable. The University of Maine Cooperative Extension notes that solid wood boards may warp and that bamboo may warp or be damaged. Follow the board maker's own care instructions.
When should I throw a cutting board away? When it can no longer be cleaned effectively, which in practice means deep grooves, cracks, splits, or, on plastic, heavy knife scarring or delamination. That applies to both materials.
Where the sources disagree, I've said so rather than picking the tidiest number. More on how this site works is on the about page.
