Sand it down and coat with cutting board oil

This post is helpful

https://www.goodhousekeeping.com/home/cleaning/a20705882/restore-wooden-cutting-board/

Once you have sanded and cleaned, I would recommend this oil:

https://www.amazon.com/gp/product/B004G6X0J2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

This site explains in detail and even tells how to make a conditioner for the wood.

https://www.hgtv.com/design/make-and-celebrate/handmade/how-to-restore-an-old-cutting-board

Wash it with liquid soap and water. Let it dry. Sand it down with 220 grit sandpaper. Wipe off with a damp cloth. You can use cutting board oil, mineral oil, or salad bowl bowl finish to protect it.

I love my wood chopping blocks. I use this method to keep them clean https://www.bobvila.com/articles/how-to-clean-butcher-block/

Hi Krista, here are some hints on refinishing your wood chopping block. Stay well.

www.hunker.com › ... › Home Design & Decor › Home Decor

Jul 17, 2017 - Refinishing a butcher block will increase its attractiveness, and the ... Filling in the wood pores so they repel food particles and liquids results in ...

THis should help: https://www.thisoldhouse.com/kitchens/21017444/restoring-a-butcher-block-countertop

Hi Krista: I would scrub it down with a 1/2 lemon and course salt. You can also use vinegar on a sponge to clean your block. Then, rub it down with food safe mineral oil. Use a cloth to wipe up any standing oil after about 10 minutes. That should do it for you. Good luck

Sand down then get lineseed oil and oil the wood let dry then oil again then your done

Hi Krista - You can use everyday all-natural items you already have in your kitchen to care for your cutting board/block. Hope this helps!

https://pinkfortitude.com/cutting-board/

PS - We have a FREE eBook with recipes for all of my homemade and all-natural cleaners. You can download it here --> https://pinkfortitude.com/thank#GreenClean

First is a kitchen superstar, lemon. Even in tough circumstances, it can work wonders in the case of butcher block. Sprinkle a bit of coarse salt onto the stained area, then rub it in with half of a lemon.

If the stain does not vanish more or less immediately, return to it a day later and see if either soap or vinegar helps the situation. You might also try baking soda, particularly if you’re dealing with a fresh spill. Blanket the stain in the powder, rub it in and let it sit, then scrub with either soap or vinegar moistening your sponge.

Then apply food-safe mineral oil or raw linseed oil. Evenly rub the oil into the wood and wipe off any excess. If the wood quickly absorbs all the oil, add another coat.

they make special beeswax for wood blocks.

Most butcher blocks are maintained with food grade mineral oil. I usually bleach any dark areas out first.

Sand the wood down to new wood then get linseed oil and oil the wood and it’s ready to use

You can give it a nice sanding then seal it up with a mix of mineral oil and beeswax. A recipe for that is here: https://www.flippingtheflip.com/2020/03/how-to-diy-beeswax-wraps-weighted-dog.html

I just refinished ours- here is the detailed instructions on hometalk- https://www.hometalk.com/44298420/how-to-restore-and-maintain-a-wood-chopping-block

How to Restore and Maintain a Wood Chopping Block