The good news is, most authentic Scandinavian furniture is made out of quality durable materials like cloth, metal and Norwegian wood to mention a few. These need to be cleaned with all natural products that are environmentally friendly. Use a micro fiber cloth (found at most Canadian Tires) to polish the metals and wood. They leave the least streak marks. If possible, remove cushions and have them dry cleaned. This will help the wear and tear on the cloth materials. Have any tares or rips professionally repaired before sending them out to the dry cleaners.
Keep the furniture in a low traffic zone. These are show pieces like antiques. They can be enjoyed on special occasions and holidays. You do not want your drunk uncle spilling red wine on your newly restores Danish Teak couch.
Keep the pieces in a temperature controlled environment. Using them in a patio scenario or a second floor terrace or balcony is not a good idea. The elements of weather will destroy your pieces. Even placing them in a damp basement or garage for an extended period of time will weather the materials and possible even rust the steel. Any type of smoke, whether it is from a cigar, stove or cigarette it will stain the furniture over time.
Enjoy it. The best times are when it’s just me and the Danish chair having a cup of tea. Take pleasure in this amazing hobby. You will love it. It’s very rewarding.