There is NO SAFE WAY of eliminating the risk of viral transmission from used syringes. Some people use bleach, others recommend soapy water, but neither will guarantee that all traces of the Hep C virus (or Hep B or HIV) are removed from the syringe.

The best thing to do is stock up on equipment so you won't be caught short in the first place. Be prepared. If it's likely that you're going to be away from home and need to use somewhere else, take some sterile fits with you. Don't rely on other people. Remember that it's not illegal to carry new (or used) syringes. Be prepared and carry more than you expect to use - having too many won't hurt you, but getting caught short might put you in a difficult, risky position.

If you decide to inject with a used fit, you are taking the risk of becoming infected with Hep C and other blood borne viruses such as Hep B and HIV. Remember, even if you already have Hep C, HIV or Hep B, you are still at risk! While the only really safe way is to use a sterile syringe and practice safer injecting, you will be safer re-using a syringe that only you have used than any syringe someone else may have used.

If you decide to keep your syringe for re-use later, it is best to clean it as soon as possible after you have used it - preferably before the blood dries. At the very least, rinse it after use with water after your hit, then follow the following cleaning instructions below before you re-use the syringe. Be very careful not to rinse in water that anyone else might use for either mixing, rinsing or drinking, and don't spray anywhere where water droplets from your fit can come into contact with anyone's injecting equipment, hands or injecting sites. Don't forget to wash your hands afterwards. Don't put your fit down where it might be mistakenly picked up by someone else. If you can, clearly mark your fit in some way so that you know it is yours.