Picked up an old pull behind sprayer for free the other day. It has a BS engine on it and a pump. Not sure how much I can actually salvage off of it, but what I really wanted was the 25 gallon tank on it either for a spray rig, or nurse tank in the truck. The tank is pretty dingy though. I need to try and clean it to see if it's salvageable. So, after searching the forum I really got nothing. What I was wanting to know is what is the best method to getting the tank clean again, or relatively clean. It looks pretty dark when you look at the tank. I'm thinking a toilet brush and long arm gloves to minimize any contact with the residue. But what solution would you use to help break the crud down. Thanks.