Originally Posted by
Mad Honk
mix of acetone and atf
Yup, good old fashioned mix.
Yet perhaps the cheapest penetrant is standalone diesel fuel. It really is an oil, not a gas, does not evaporate. Buying it in jerry cans allows me to fill up entire tubes and stays with it.
And when I drain it, I catch it all and store it for future use again.
PB blaster is just too expensive to use in quantity.