The famous question we always get asked! Geodesic domes can be semi-permanent or permanent structures made of steel and hard wearing, durable PVC so able to withstand many different elements. We would expect the life expectancy to be at least 10 years. For harsher climates you may need to replace the PVC cover at about the 5-8-year mark. It's recommended you keep your dome clean to help it last longer and abstain from using harsh chemicals to clean as this can weaken the integrity of the cover. For the insulation, a damp cloth and some mild eco detergent will do the trick. If things need a really good clean you could also look at an upholstery cleaner. In Australia we've found our friends at Electrodry really good as they are knowledgeable about what to use to clean what products. As with anything, good maintenance means it will last longer.