Download it here. The app is searchable in the Google Play Store under Sailboat Owners.
Sorry iPhone/iPad users, we are still waiting on Apple. :(Click the X in the upper right corner to make this go away
I used muriatic acid from Home Depot/Lowes for about $8.00 for one gallon of the concentrated stuff (about 4 years ago, so it may be a little more now). Use rubber gloves and consider a respirator (I did it outside and when the wind shifted I held my breath because that stuff is very strong). It cleaned out my heat exchanger in no time and I only used half a gallon. I took the heat exchanger off the boat and removed the end caps to pour the acid through the inside of the tubes and poured it into the fresh water inlet and outlet and then the coolant inlet/outlet. Its been 4 years and it is still flowing well.
Tom. Best to try and pressure test before re installing. You have to systems. The raw water and the coolant side. Each should be pressurized to assure no leaks occur between them or out of the Heat Exchanger. Then you can install with confidence. Most radiator shops can run a test for you. Maybe $20 at most. Cash. Better now then to discover after you have reinstalled that there is a coolant leak running out the exhaust.