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This is a tutorial for making soap out of oils, distilled water (car battery water) and NaOH (drain cleaner). The soap works as well as store bought but has a shorter shelf life (a few months if unused) because surplus oil (that otherwise provide a moisturizing effect) can go off.

If basic safety precautions are being applied, it's a safe process. However, we are dealing with a strong base and such chemicals should always be handled with care.

The recepie is calculated Feel free to experiment.


250g canola oil

250g coconut oil

190g water

75g NaOH

15g fragrant oil (optional)


Blender, bowl, rubber kitchen scraper (slickepott), scales, empty >500ml jar and molds.

For safety, use safety gloves and safety glasses.

Set up

Verify you have all ingredients at hand and a clean workspace.

Making the lye

Lye is NaOH (or sometimes KaOH) dissolved in water.

Fill the empty jar with 190g of water.

Go to a well ventilated area (here I go ouside) and put on gloves and safety glasses.

Weigh 75g NaOH in the measure and add it to the water. NaOH IS A STRONG BASE, TAKE CARE NOT TO SPILL OR BREATHE IN FUMES.

Screw on the lid securely and swivel it around to mix. THE JAR WILL START GETTING VERY HOT, CAREFUL NOT TO DROP IT OR BURN YOURSELF!!

Loosen the lid once or twice to release excess pressure from temperature increase.

Keep swiveling at least a few times per minute until not more than what looks like a teaspoon of crystals remain.

Verify lid secured and leave the jar in the ventilated area to cool down.

Making the oil mixture

Weigh 250g canola oil and 250g coconut oil in a bowl

Heat the oil mixture in the microwave at 600W or below for 30 seconds. Notice it's enough to make it quite hot. Stir to help dissolve the coconut oil and wait several minutes to let it cool down a bit. Repeat this process untill you have a clear oil mixture.


Mixing lye and oils

Before putting on gloves and safety glasses again, verify you have your blender, clear oil mixture, fragrance, rubber kitchen scraper (slickepott) and molds ready.

Put on gloves and glasses and bring in the lye. Both the lye and the oil mixture should be cool or room temperature.

Pour the lye in the oil mixture. There will be some NaOH crystals still at the bottom of the jar. Don't pour them in. Rinse and fill the jar from the sink tap and put it in the sink.

Blend your mixture for at least 5 minutes. The fluid may start to thicken. Add fragrance if you want and mix again.

Remove the blender from the bowl and instead blend the water in the old lye jar. Then immediately rinse both under warm tap water. This greatly simplifies dishes.

Now stir the soap blend with the rubber kitchen scraper (slickepott) while pouring the molds, and use it to get all of the soap out.

When poured, rinse both with warm water and wash the dishes ( this is easiest right afterwards).

Finally, put lids on the molds and place them where you can leave them for a few days. Careful not to spill! After this you can remove gloves and safety glasses.

Should you feel an itch or other discomfort on your hands, some trace NaOH may have found its way to your skin. Rinse with water and wash your hands.

The soap needs to cure for a day, but can after that be easily removed from the (at least these) molds by placing them upside down in the sink, running hot water over them, then squeezing the (upward facing) bottom of the container. Molds can also be 3d-printed.

This soap will have a shelf life (under closed lid) of a few months. Extended life if kept in fridge. 'Expiring' would result in that the surface starts to darken and smell bad. In this case, the soap is still usable and if used, the bad surface will be used up to reveal a probably completely fine soap below, if not too much time has passed.

Experimental liquid soap for the bold and fearless.

When the soap has cured, take 1 part soap and 4 parts battery water and put in a pan. Put on low to medium heat and stir untill soap is melted. No need to boil or simmer, just melt thoroughly.

Let soap cool down and wait another day.

Preferably pour in a bottle with a FOAMING PUMP (see the PalmOlive pump on the first picture. Just buy one at a store and use the existing soap to refill a regular soap bottle.

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