depends on the level of deterioration whether they are salvageable.
Not pointing a finger at you, but you can tell who has high use of their RVs and who are 'grab & go' weekenders. Typically folks who use their RVs a lot, do the needed maintenance; weekenders don't. Cleaning and UV protection is critical; especially the rubber and plastic parts. There are plenty of high-quality products on the market. If you don't make the time to use them, you will be opening your wallet further doing repairs.