Instructables
Picture of 5 Great Lemon Tricks
Usually used for making lemonade, lemons have many uses besides food. With a bag of lemons around the house, you can some up with some cool projects!

Here are 5 of the most interesting i found, if you have more link to them in the comments!
 
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Step 1: Mold Removal

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You can remove mold by rubbing lemon juice where you see it. Mold should dissipate soon after!

Step 2: Invisible Ink

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You can make your own secret spy invisible ink with lemon juice.

Take a q-tip and soak it in lemon juice. Use the Q-tip to write on the paper. Once the lemon juice is dry you can use heat from a lamp to reveal a secret message!

Step 3: Boost Laundry Detergent

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Use 1 cup of lemon juice in your wash to boost the effectiveness of your laundry detergent.

Step 4: Blonde Highlights

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Use lemon juice to get blond highlights, just apply and then sit out side. Repeat the process over a weeks time for best results.

Step 5: Electric Lemon

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Lemons can give you electricity! 

1. roll the lemon to get the juices
2. Cut 2 slits in the lemon
3. in one slit place a dime, the other use a penny.
4. Now you have electricity from a lemon, you can test how much with a multimeter.
Lemon juice also works great in blonde hair is a lightening agent... You just soak it...or strand it... Go out in the sun for an hour...and come back in with lighter hair... Has to be the real lemons though... Lemon juice from a bottle will not work... Neither will limes.... A vinegar rinse in your hair will leave it nice and shiny... Only drawback is...the smell(which I personally like..others maybe not so much...lol)
Leosmama4 years ago
also works as a spot remover on many clothes - dab lemon juice on the spot/stain and lay clothes out in the sun.
I managed to get some banana stains off my sons T-shirt that had been there for some time. :)
Shiftlock4 years ago
White vinegar works just as well for boosting laundry detergent, and it's inexpensive. I buy it in the gallon-size bottles. I always add half a cup to my laundry, but use only half as much laundry detergent. Works wonderfully.

I've been wondering if I can pre-mix the two (vinegar and detergent) in a bottle so I only have one thing to add to my laundry? I don't see why not... Planning to try that.