It's called "Citrisolve" or commonly known as Citric Acid.
Are you sure about those names? I’ve used both Citrisolve and Citric
Acid and in my experience they are not the same thing at all.
Citrisolve is, according to www.citrisolve.com, “based on a
biodegradable citrus oil solvent” which is found naturally in the
skins of citrus fruits. The active ingredient is a monocyclic terpene
hydrocarbon. It is sold as a cleaning product or solvent in fluid
form with a strong citrus odor.
Citrisolve and similar products are indeed great for dissolving and
removing stuff like wax and the glue from sticky labels (a little of
the oil squeezed directly from skin of a citrus fruit itself will do
in a pinch). Citrisolve is also great for cleaning dirty bicycle
chains. This stuff is not edible.
Citric Acid (aka 2-hydroxy-1,2,3-propanetricarboxylic acid) is an
organic carboxylic acid typically found in the juice of citrus fruits
and used in the food industry as a souring agent. It is usually sold
as a white powder or as fine white granules.
Citric Acid also happens to make a very satisfactory substitute for
Sparex et al for use as a pickling solution in gold and silver work.
I believe you will find that the two are not interchangeable.
in The City of Light