I had mine off the front seats in my 2005 to clean both and redo the foam on the drivers seat. It's pretty .straight forward, but takes some time and patience. I cleaned mine with simple green, a brush and a hose and they came out great, It you go the washer route, I wouldn't put them in a dryer, they fit tight as it is and you don't want them shrinking.
FWIW I've removed the OEM covers on most vehicles I've owned....just an FYI, use zip ties in place of hog rings for reassembly. They allow you to loosely fasten at all the points the hog rings were used and align the covers before cinching them all down.