Covers are delicate and need to be treated with great care. With your cleaning service Spa King will keep your cover clean and apply 303 vinyl protectant as needed. Here is a list of what Spa King recommends Spa owners can do to extend the life of their Spa. 1) Never stack items on cover. We often find rips, tears and dents in the foam of Spa covers. Once this happens water can get into the cover. 2)