There is a common misconception about the fact that because motorbike helmets are so tough, they can be treated roughly. This is not true, and your safety helmet needs to be handled with great care.
Always keep in mind that you may one day look to your helmet to save your life, so treat it well and respectfully.
Follow the guidelines presented below and you can be confident that your helmet will be in peak condition if called upon to perform.
As a minimum you need to read the instructions. They may contain specific information with regard to what cleaning materials may and may not be used on your brand of helmet.
If you can avoid it, do not carry a spare helmet around on your bike with you, unless it is being worn by your passenger. Most bikes cannot hold a spare helmet securely, so your helmet is not protected.
Get into the habit of cleaning the face guard regularly. Check with your helmet manual, but if in doubt use a very gentle and mild soap or detergent, with a soft cloth. Something that you would use on sensitive skin. If you notice scratches on your face protection guard then you should seriously think about getting a new one. The effect of a scratch is magnified during night driving, and also if you are driving into the sun.
Do not leave your helmet on the seat of your bike when you get off. Your motor bike seat is for sitting on, not placing your spare helmet on. Find a solid, secure place.
And never drill into your helmet to fit anything like a radio.
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Treat your helmet as the amazing piece of technology that it is. It is not supposed to be part of your fashion wardrobe, or accessory collection.