You could try the brake fluid as it is supposed to work fairly well.
There are two major problems with brake fluid though:
1) It is hard to dispose of and will blind you if it gets in your eyes
2) It leaves an oily film on the model that has to be removed
I would recommend you go to Walmart or an auto store and get some Castrol Super Clean degreaser or get a can of Easy-Off oven cleaner in the yellow can at either Walmart or the grocery store. They both work great and are biodegradable so you can wash them right down the sink.
Mike
“Wisdom is the right use of knowledge. To know is not
to be wise. Many men know a great deal, and are all the greater fools
for it. There is no fool so great a fool as a knowing fool. But to know
how to use knowledge is to have wisdom. " Charles Spurgeon