I was moving the plant and it fell on the floor. L...

For now I would just try to shake off as much loose debris as possible with out spreading it to other buds. Your so close to harvest by the looks of the buds you don't want to damage the fresh trichomes by touching or brushing them off. After you have removed the fan and larger sugar leaves separate out the buds that are clean. Hang them horizontally using some wire so soil doesn't spread to lower cleaner buds and dry them to 62% humidity then lightly trim off an soil particles until you reach clean bud. Not going to lie but it could turn into a bit of extra work but you should be able to salvage them. Use a magnifying glass to see if you need to do any additional trimming good luck I hope this helps you out.