After you wash this stuff off real well, hit the plastic part with some tire cleaner and let it sit a bit before wiping off.
For aluminum and steel first degrease the part pretty well. Then hit the degreaser and a good mix of oven cleaner. Mix the two with the toothbrush and let it sit. After a while (up to 1/2 hour) of sitting remove the stuff and see where you are. If no movement add some Toluene (used to be in the good carb cleaners, burt it seems to have disappeared on shelves here. Degreaser, oven cleaner and a shot or two of toluene and mix it and let sit. If that doesn't take everything off - you're going to an acid bath.
Seriously, I haven't met anything yet - up to some serious rust, that this stuff won't help you along. Sometimes I stay on the weak side and repeat the process 3, 4 or 5 times. Get too bold and it will etch/ leech into metal.
Any part you're going to paint after soaking it in this has to be really cleaned afterwards or the paint will bubble up as long as this stuff is present. Soak in soap and water, rinse well, dry and then brake cleaner - works pretty well.
If you are also referring to the nuts and bolts - those are all wire wheeled on a bench grinder and then polished with metal paste. Cleaned off and then cleared to save them for a little while. The chrome ones are just polished and hit with chrome cleaner to keep them.
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