A full cleaning is a full-service visit, with fresh linens and towels, toiletries, vacuuming, a scrub-down for the kitchen… the usual sort of resort cleanup. And yes, you get new towels every four days. At SSR, they put it all in a basket outside the door first thing in the morning!
You can also order a full cleaning visit at the front desk when you check in for a small fee. Give them the date you’d like them to vist, and they will add it to your bill.