Moms have blessed us with an amazing laundry fact that has apparently been around forever. Turns out that plastic lid cup that comes with your washing detergent is so much than for measuring liquid.

A little known fact was shared in the private Facebook group Mums Who Clean and the tip-off has reeled in millions of comments and views.

While all of us probably use the lids of our detergent bottles for measuring out the soup it turns out you’re meant to put the plastic lid or cup into the wash with your load. That way all of the detergent soap can be rinsed from it. This means that not only do your clothes get the exact amount of detergent it needs but it also means that this method will keep you from getting that messy soap up in your cup.

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When the load is finished you scoop out the squeaky clean cup and use it for next time!

Don’t forget to be careful!

This hack doesn’t apply to all caps. Some brands will specify that the cup can’t be added i to your wash. According to news.com.au “There could be a risk of damaging parts and components, within the bowl itself, in relation to the agitator…It could get caught or trapped under the agitator or damage the fins of the agitator. Also it could damage the plastic cup you put in, resulting in bits of plastic going through your clothes.”