Sdsester is on it again! I agree with the chalky observation. Old oil-based paint is notorious for chalking up after 7 or 8 years, even sooner if exposed to direct sunlight. You could wipe them down with warm water and a mild detergent to see how well they clean up. Some chalky surfaces clean up well and look as good as the day the paint was applied. If they don't look so good at least you have them prepped for the next paint job.