Water syringe for wisdom teeth?

i had all 4 wisdom teeth removed one week ago. And i had a followup today, because i was still in a lot of pain. They told me i had food impacted in my holes, and sent me home with a water syringe. The doctor told me to clean the holes after i ate. But im not really sure how..am i supposed to put the tip IN the hole? or just squirt on top where my stitches are?..the doctor actually put the tip in the hole and a lot of gunk came out...so im wondering if i was supposed to do that? and if so....how?? i cant seem to find the spot he used to get in the extraction cavity..any help or tips would be greatly appreciated. thanks!