Generally speaking, wicker is not a specific material. Instead, wicker refers to the act of weaving chair seats and furniture, or it's the final end-result product, such as a woven chair, loveseat, or sofa. A variety of materials are used to make wicker furniture. The following is a breakdown of the most used materials for wicker loveseats:
Wicker Whereabouts
You can put your wicker loveseat outside on your deck, but leaving it out, exposed to the elements is not the best idea. The elements will rot the fibers eventually destroying the piece after a period of time. It's great to enjoy your wicker loveseat outside, but do not subject it to harsh weather for extended periods.
Cleaning Wicker
The best to way to clean your wicker loveseat is by vacuuming it. If this process doesn't work, you can spray it down with water, sponge washing it with a light detergent.