Maintenance, Clean and care is an important part of making the cover last longer and keeping up the performance of the fabric. Please see cover care on our website. Cover Care
This maintenance of clean and care should happen as soon as you start seeing dirt, dust, leaves, etc. accumulate on the cover. After time, weather and cleaning as the water resistance wears, rewaterproof it! See Cover Care about rewaterproofing. Don't use brands of waterproofing we don't recommend, they might actually accelerate the aging of the fabric.
It will extend the life of your cover!