Pressure wash cal 20
I have a great little cal 20 that's fortunely is already painted, varnished an wired with great little bulkhead lamps. I don't know if yours is the same, but I would not advise pressure washing inside. remove the paint with a scraper, and a vacuum handy. If there's patches left on that won't come off just sand them down, give it a couple of coats of primer (sand with very smooth sand paper (150 maybe) inbetween primer coats, and roll on easy epoxy. I just acquired a cal 34 and paid some experienced painters to do the enterior that was peeling off, and that's the procedure they used. Or you could buy mine.