I scraped my knee yesterday and I wasn't able to clean it immediately, now there are pieces of dirt from the gritty road stuck on my wound.. I rinsed it under water for 10 minutes and tried to picked it off but the very tiny pieces wouldn't come off.. I want to ask will my wound be infected if the dirt isn't cleared out even if I've cleaned it?

Its a Saturday and this doesn't seem to be serious enough for me to go A&E and wait 3 hours ...

thanks