If you wish to take PEP, you can ask a doctor about getting PEP, if it has been less than 72 hours since this event.
Otherwise, you can take a 4th or 5th generation HIV test 28 days (or longer) after this event for your conclusive result. For future reference, there is no need to wash your penis, especially with alcohol, following any sexual event. You cannot wash off or disinfect any STDs or HIV, and alcohol will only irritate your penis.