its called Purple Power. you can get it at Autozone, Lowes, etc.. i got a big plastic bin from walmart and poured two huge jugs of that stuff in, don't water it down.
it WILL eat up aluminum, but only if you leave it in there....you can use it to clean aluminum, just get it off after your done.
i have soaked steel parts for months on end and no problems and no rusting.
put the pump in for a day and the crude will wipe off....leave in longer and it will be even better. 2 days and you will be able to push the grease off by hand and it will be all sludgy and settle in the bottom of the bin.
i haven't changed my cocktail, i just keep adding Purple Power too it to make it strong again.
i left my timing chain in it for over 6 months....came out looking brand new.
since its full concentrate...WEAR GLOVES! it will eat your hands right up and burn.