I Use Both spray can and brush , on a larger flat Carrs Acidip to start with, than Gw white in a spray can,
on a smaller flat Humbrol white all the way, better control and you dont clog details if you put on several thin coats, BTW carrs Acidip is not an acid
its a really great degreaser for white metal or resin, you can find from model railway suppliers, and it does what the distilled vinegar does a lot quicker! hope that helps..... Gerry.