Other contributors have said "How long after a perm can you wash it?" is the same question as "How long after a perm can you wash your hair?" If you believe that these are not asking the same thing and should be answered differently, click here
Wash your hair before you perm, but don't use conditioner. Damp hair is easier to wrap around perm rollers, and it's going to be a while before you can re-wash your hair after the perm!
After the...