Originally Posted by djmarchand
I would use one of the commercial products made for this purpose: Rydline, Barnacle Buster, CLR, etc. Dilute it in accordance with the directions, 1:1 i think. Muriatic is too strong an acid for laymen's use. Also the commercial stuff has detergents that will help remove an oil that may be bound up with the scale.
Note: David is a frequent contributor to Boat Diesel.com and really knows his stuff. (He and Tony Athens keep a lot of folks (like me!) out of trouble & I take his writings to heart.) Thanks, David, for your contributions to TrawlerForum.