BRUSH (really well). For more info on brushing your permanent retainer, see this website here.
FLOSS (really well). We recommend SuperFloss, which you can pick up at any drug store or grocery store in the tooth care section. It’s precut strands of floss that resemble a shoestring with a hard plastic tip on one end. You can get up under the wire of your permanent retainer and floss, then slide the SuperFloss back out.
SEE YOUR HYGENIST AND DENTIST regularly. They can get all the built up plaque out of those nooks and crannies. It’s especially important to see them each 6 months when you have a permanent retainer.