Experienced motorists know that one of the most important reasons for unstable engine and ignition performance is poor spark plug condition. There are many "folk" ways to "revive" these, but not all of them are equally good, and most importantly, they are available to a wide range of people. That is why it is worth taking into account a simple, but at the same time very effective method.
What is needed: Acetic acid (70 percent), baking soda, unnecessary toothbrush.
It should be noted right away that table vinegar is not suitable for the implementation of this technique. We need exactly 70 percent acetic acid. For this reason, it is very important to be careful when handling reagents. In addition, you need to take into account a toothbrush that has already worked its way out and will no longer be used for hygiene procedures. Now, with regard to directly the method of cleaning candles from carbon deposits.
Important: The acid cleaning procedure must be carried out in a well ventilated area. Use personal protective equipment for eyes, respiratory tract and hands. Never inhale acid vapors!
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We take candles and put them in a plastic container, after which we immediately fill them with acetic acid. You need to fill it so that the units are completely immersed in the composition with the whole body. "Forget" about the candles for 30 minutes, after which we add half a tablespoon of baking soda. We leave the solution alone with ourselves for another 20 minutes.
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It remains to carefully remove the candles from the solution (one at a time) and rub them thoroughly with a toothbrush, finally cleaning them from dirt and carbon deposits.
Continuing the topic, read about 7 reasons why a car engine stalls on the go and not only.
A source: https://novate.ru/blogs/171019/52102/