Not sure many people do anything about it except buy a new ladder. Thats probably the best thing, but if its a 2 man ladder (steps on both sides) its probably expensive. I guess just weigh your options of time+aggravation+$$ spent vs buying a new one. I’m assuming its fiberglass? Realistically you can prob (without turning this into a huge project) just spray on any kind of clear coat with UV protection (the sun ruins everything). Maybe just hose if down and spray on a few coats of urethane, or some type of spray on marine clear coat (no idea if theres any difference) maybe its thicker? I’m guessing. If the issue is the fiberglass is coming through, getting in your skin, I’m betting you can probably use most anything to top coat it and get some more life out of the thing.. try youtube.. at work once they get like that or develop a crack, most just go in the dumpster.
One question worth asking is do you need a 2 man ladder?? Sometimes its just easier to buy new and make life easy. If it were me I’d just take trip to HD, look at what spray on clear coats were on the shelf and try one..