How do you fix the L and R buttons

Well, I just found this out a few months ago. The L and R buttons on my 3DS were worn out; luckily, I found out how to get them working again.

You need these materials:
- Your 3DS
- WD-40
- Cotton swab
- Paper towels ( or something else as long it can wipe away the WD-40 )

Let's begin with the steps. First, get your 3DS. You need to blow on the L and R buttons where there is just a little space between both of them. Second, get a few cotton swabs ( you probably should have one ) and apply a little Wd-40 on each end. Lift up the button just a little bit with your fingertips and apply the WD-40 to the button. Repeat the process for both buttons. Third, the WD-40 might/will drip down from the buttons so wipe it with a paper towel. Finally, blow once more into the buttons so that it dries into them.
Note: It will take some time for the WD-40 to clean the L and R buttons, so wait for a few minutes until they function properly. After some time, test it out to see if it worked.