If it is the clear coat that turns cloudy, or shows cracks that look like fine scratches, especially on the Bronzit color on '89s, why not carefully sand the clear down to good paint/clear and respray the clear only?

Hood, top and trunk appear to be cloudy/dirty/faded/mottled, even after washing. Might these areas benefit from clay?

Car not garaged, polished or waxed, but routinely exposed to oak, maple and pine tree leaves, aphid droppings etc. for last eleven years.