4 parts water to 1 part molasses. You need to let it ferment for about two weeks before using it as it works better the longer it ferments, the beauty about it is you can keep re-using the bath and it is environmentally friendly.... keep the lid on it to avoid water evaporation and to keep the bloody flies out.
I also use undiluted white vinegar for small parts that are surface rusted like bolts and brackets... keep an eye on parts in vinegar though as it will eat through the metal if left in too long... I find 2 to 3 days soaking is plenty to remove surface rust.
With both ways make sure you wash off well with water to neutralise the solution






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