Just a question

ive been meeting a guy for quick oral for a while now, always at a nice little park where no one is around, he wants to fuck so badly as do I but aits always after work and I know I am not all that clean up there, so my question is aside from going home and cleaning myself out what can I do easily say in the bathroom at work to make sure I am clean. I want this so bad but I cant go home smelling like crap .