You cannot and should not share a razor even if you clean it.
Even though you clean the razor there's still some potential health risk that can occur when you share razors with other people.
When you shave with a razor it can create tiny cuts on the skin where you shave and sharing a razor can allow bacteria as well as viruses to transfer between users and enter the body through the tiny cuts on the skin.
As a result you could become infected or other people can become infected when sharing razors.
It's not worth the risk and you should always use your own razors and when using disposable razors you should throw the razor away when done and use a new one each time you need to shave.
Cleaning a razor may not always eliminate all types of bacteria or viruses that could be on the razor blade, especially if they are the bacteria or viruses that cause bloodborne infections such as HIV, Hepatitis B or C.
Shaving creates microscopic cuts on the skin, which cannot easily be seen and the cuts are an entry point for viruses and bacteria to enter when you use someone else's razor.
Your skin type and your hair texture can also react differently to a razor blade than someone else's and potentially cause irritation or skin issues.
You should also use your own razor for personal hygiene and to also minimize the risk of an infection.
And you should also mark your razor to prevent accidental misuse by someone else.