We reclipped the track on my son's sled, it wasn't too bad. We were able to remove the old clips with screwdrivers and vice grips (lots of pyring). Most of them bent easily as they were getting thin and came right off.
Got new clips and a clip installation tool that uses a center bolt to do the crimping. This worked well but we pretty much wore it out (we were using a 18V dewalt to install). If you can spring the $$ for the track clip tool that has a crimper with 2 long levers, it should work better.
We had to pull the rear suspension but didn't pull the track. That would have been easier though to remove the track but we didn't want to mess with pulling the drive axle.
Clips will wear out - the more you ride in snirt and marginal conditions, the faster. I store my sleds off the ground, not sure if thie helps or not. The sled that we changed the clips on, had about 4K miles at the time - but I had another sled, all UP miles / deeper snow, 8200 miles and the clips still looked pretty good. So longevity depends on riding conditions and storage conditions, too. If you stored it off the ground, you're fine. I don't think the pressure washer caused you any problems -