How To Clean A Kitchen Knife With Bleach

It’s time to clean the blade of your favorite knife, and we recommend using bleach.

If you have one of these knives, we’re here to give you the tools you need to get it ready for the kitchen. If you buy one, we’re here to show you how to clean it quickly and effectively with our handy, bleach safe method. If you’re curious, you might want to check out our other tutorial for cutting up a bunch of onions without killing yourself.

Here are all of the products you’ll need.  


1 cup water 1 Tablespoon liquid dish soap (such as Purex) 2 Tablespoons borax 1 cup vinegar 3 Tablespoons salt

This may be an old video from before I’d had time to do things right. The last video is here , and the first is here .

This is your kitchen knife, and here’s what we’re going to do with it . In addition to cutting foods, you can also safely cut with it, and here’s how.

Start by washing it with a hose/spray bottle full of water.

Then rinse it off with warm water, which should only be slightly more than hot. You want to make sure it’s actually hot enough to reach the water on a stovetop, so be sure and do that before you begin. 

After the knife has completely rinsed, you can start washing it with dish soap and bleach. I’ll use this photo as my rule of thumb, and then you can judge for yourself. 

Don’t worry about drying it out or losing the water color, as long as you aren’t wearing the knife while doing it. But the bleach is going to get rid of any residual oil that is left behind, so it’s best done before use. 

This is a picture of two of the knives after doing the two processes. They should look like this now. They will need to be washed with a little more shampoo, and maybe some more bleach if you’ve got some on hand. Be sure and use the same amount for both, or try to make one a little thicker to make it easier to cut with.  We’ll need this thick knife to chop up a bunch of onions.  I’d also put this knife to use on a lot of things that normally require a dull knife to cut, like slicing a head of cabbage or peeling or shredding a large leaf of cucumber. It’s easy to clean, and it will help you get more bang for your buck with regards to cutting weight and time.

Once you do enough of these things with this knife to get a feel for it, you can continue to wash it, just not as often. We hope this all helps. If you need anything else in the meantime, we got you. We’ll be in touch.

[Edit 8/3/2014] I’ve updated this post to make it a little simpler for anyone to follow.