(You gasped right out loud didn't you...I know I did)
This one was easy, I just He-Manned (You remember He Man, Master of the Universe) the washer and dryer out of the way. I was pleasantly surprised to find only 3 socks behind the washer and I even still have the mate to one of them! I Vacuumed first with the shop vac, then followed up with the Shark vac (love that little Shark vac) and then mopped the floor on my hands and knees...my little girls think it's funny when I mop the floor on my hands and knees, they call me Momerella. I wiped down the backs of the appliances and also the cords and the walls. All in all, it was a pretty fast little project!
After putting the washer and dryer back in place I wiped down the other side of the floor...again on my hands and knees, and happened to come face to face with this vent. My first thought was, "Crawl away!" but my new and improved attitude took over and I removed the grate, grabbed my shop vac and cleaned that little sucker right out!