Originally Posted by Old Fool
heated sodium hydroxide, (super clean or purple power or others) =Same principle as oven cleaner ( sodium hydroxide).
Just be careful, the hotter the solution is the more reactive it is.
Eye protection would be very wise.
Be very carefull it can be damaging to aluminum. I once sprayed oven cleaner on the engine of a motorcycle before it had cooled properly. To my horror I watched as the oven cleaner turned the aluminum almost black.