Rinsing a new boiler

[steamer68]

Just received my new o gauge loco and tender from MSS and I'm really happy with my purchase a nice looking loco. Anyway the guy at MSS Trevor recommends the boiler to be rinsed out with warm water and a drop of liquid a couple of times just in case of any loose solder. Do you guys rinse your new loco boilers the same way.

[Big Jim]

I have never owned a new boiler. All my.stuff has come pre-loved.

I would say that this is sage advise though.