acetone is not that bad of a cleaner for bare metal uses only. it shouldn't be use as a cleaner for porous substrate like primers or paints.
I use acetone on every roll cage I build to clean off the sharpie marker marks with no problems at all.
when and if your going to use it on bare metal you have to just like with all cleaning products have to wipe a small area and before the product dries wipe it back off clean and dry.
you most likely will have a problem with acetone if you just wipe it on the surface and not wipe it back off. by not wiping it off when it's wet you will leave a residue of the acetone on the surface that could easily give you adhesion problems later on with other products.
needless to say in many cases ( if your not dealing with sharpie marker marks ) to just use a metal cleaner product. many metal cleaning products you use the same way as you do with a pre body work grease and wax remover and a pre paint cleaner.
if your going to use an alcohol you would want to use Isopropyl alcohol .
this makes for a very good cleaner . I use it often as my go to cleaner because it low cost and readily available.
for a pre body work cleaner I mix it in a spray bottle 75% alcohol to 25 distilled water.
for a pre paint cleaner I tend to mix it 50% to 50%.
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