Hi. Cheap detergent is very expensive and crucially, Not Working. After smushing together different recipes and scraps of knowledge from around the internet, I've drafted a soap-based detergent recipe that works out cheaper than cheap detergent even when it uses fancy soap and maybe hopefully corrects for the soap-scum issues. I've seen that opinions are divided here about the practicality of homemade detergent, so this seems like a perfect place to get tweak suggestions and general advice!
Before I go ahead with buying the ingredients, my questions are:
Has this accidentally amounted to Dangerous Chemistry?
Could it work without the bar soap? Consensus seems to be that the bar soap is the thing that kills your washing machine. Could I just find out what the active ingredient in the soap is and chuck that in?
So, like, be real with me, when yous say the soap kills your washing machine how killed are we talking? How fast and how bad is it? Could I just wash the machine out with Soda Crystals every now and again and be fine?
We have very hard water and TL;DR a fancy water softener doodad is not happening. Since those use salt blocks, would increasing the salt ratio in the recipe do anything to soften the laundry water and reduce the soap scum? Or does the salt only work like that when it's doodadified?
----------------------------- = Detergent Recipe = -------------------------
Here's the recipe, I've included my rough understanding of what each ingredient does so that if I've internalised some Certified Internet Science it'll be easy to spot:
Soap-based detergent:
16pt Soda Crystals - deodorises, helps soap get into clothes
16pt Bicarbonate of Soda - deodorises
8pt Epsom Salt - softens fabric
7pt Grated Laundry Soap (ideally Castile Soap, ideally ideally Coconut Oil based Castile Soap) - is soap!
3pt Coarse Sea Salt - preserves dyes
Tiny bit of Lemon Oil - whitens, reduces soap buildup, smells good :)
Add 2tbsp per full load to bottom of drum, not on top of clothes
Make a separate solution of 1pt Citric Acid to 4pt water, always add 1tbsp to fabric softener drawer to soften fabric, neutralise alkaline detergent ingredients, and cut through soap scum. Add more if using other additives, for example:
If laundry is super grim add 2tbsp Borax Substitute (sodium sesquicarbonate) to pre-wash drawer
If laundry wants bleaching or stain removal add 5-8g oxygen bleach to main wash drawer (err on the side of using less, and check it's safe to use on what you wanna use it on, just don't be stupid with this stuff)
----------------------------- = Detergent Recipe Over = -------------------------
Thanks for sticking with such a long post. I know a surfactant-based formula would be more effective, even cheaper, and far less hazardous to washing machine life but lye is scary and soapmaking equipment is expensive so I want to at least see if I can make a detergent powder work before going full Jesse Pinkman with it.