Oh boy. poor dog! I would NOT clean it, if the inner-quick-fleshy part is still hanging out, that's gotta be very sensitive. I'd visit the vet, I don't think corn starch is indicated to stop bleeding on a would like that, and he'd likely need oral antibiotics, not just an ointment. But it depends on their vet, too, calling for advice doesn't cost anything!
“Your birth is a mistake you'll spend your whole life trying to correct.” Chuck Palahniuk
I love pus but I hate people.
I can say words like undifferentiated gonads now!