One of my horses had a really bad scrape, it happened out in the pasture during a storm, we never figured out what he did it on but something stabbed him and then ripped it in a perfect right angle. Since it happened during the night, we missed our window for stitches so I was furazoning and using the spray topical. The spray was twice a day I think. Anyway, I was scrubbing it with a betadine solution and hosing it daily and I got in trouble with the vet ... it bothered me that he'd get sawdust in it or little pieces of dirt but in order for it to heal I needed to allow it to scab over. So yes, let it scab.... :)
"Be a best friend, tell the truth, and overuse I love you
Go to work, do your best, don't outsmart your common sense
Never let your prayin knees get lazy
And love like crazy"