Guest Posts

How to Use Just the Right Amount of Laundry Detergent



Dear Mary: I love all of your washing machine tips, but can you guide us on how to use the correct amount of detergent? I know you say small amounts, but can one tell by feeling the water? I hate to do a load with too little or too much, and it feels like a guessing game. I tried googling this, but the info was not helpful. You are such an expert on these things that I thought you might have some additional tips – if you can bear the thought of another post about laundry, that is! Hugs to you for such fantastic work. — Your Anonymous Fan

Dear A.F.: Great question. And yes, flattery did get your letter to the top of the pile so good job on that!

Most of us use way too much laundry detergent, which can present all kinds of problems like skin irritation, grayish looking whites and stiff scratchy clothes and linens. Whatever amount of detergent you use, it must be completely rinsed away for the results to be beautifully clean, whiter-than-white, brighter-than-bright colors, soft clothes and linens.

Generally, (and I say that word because there are so many variables, which I’ll touch on shortly) if you have soft water use 1 tablespoon (1/16 cup) of HE (high-efficiency) detergent per wash load. If you have hard water, use 2 tablespoons (1/8 cup), which begs the question “How do I know if my water is hard or soft?”

Call your water company or go to its website to learn the grains of hardness per gallon (expressed as “gpg”) in your local water supply. According to the Water Quality Association, soft water: 0 – 3.5 grains per gallon (gpg); moderate: 3.5-7.0 gpg; hard: 7.0-10.5 gpg, and very hard: over 10.5 gpg. If your water is moderately hard and you want to be very precise, use 1.5 tablespoons of HE detergent per load.

Another variable will be washing machine capacity. If it’s a super-duper-jumbo size machine, you need to adjust the amount of detergent accordingly. Check the owner manual.

Also, you may need to use more or less detergent if you’re running a heavily soiled load (more) or a very small load (less).

Above all, the most important thing to consider when it comes to laundry detergent is whether or not the detergent gets completely rinsed away before that load of laundry is finished. I always add 1/2 cup of white vinegar to the last rinse (I pour it into the liquid softener compartment so it gets released at the proper time). Vinegar helps to get rid of all of the detergent, leaving items soft and fluffy without the need of any softening products, which can present allergic-like rashes, skin irritations and even respiratory reactions in some people.

The next time that you do a load of wash, take a washcloth out of the dryer when finished and put it in a warm dish of water. If the water remains clean, you have not used too much detergent. If water turns even slightly cloudy, it means that all of the detergent has not been removed; you’re using too much detergent,

If your whites have turned gray, that’s a good indication that your washing method has resulted in a build-up of left-in laundry detergent. If your towel comes out stiff and scratchy — you guessed it — too much detergent.

Finding the exact amount of laundry detergent you need — given the hardness of your water, the size of your washing machine and the size of the laundry load — may take experimentation. But once you discover what’s right for you — and you are getting all of that detergent out of the clothes, too — I think you’re going to be pleasantly surprised by the fantastic results.

I don’t think you’ll find a better (or cheaper!) HE laundry detergent than our homemade HE laundry detergent. It is concentrated, and 2 tablespoons (or less) per load produces fantastic results!

Thanks for your kind words. They made my day.


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