why rca ground isolators just sound better than cleaning ground points

i had my car jacked up, and i was undertheeth it

now as i was messing around with something somewhat near the oil filter
it was some thingie that has an electronical ground thingie on it and i was
unscrewing the two little bolt like screws in it

i was unscrewing it to clean the wires on it like so many of you recomend
to get rid of ground looping and engine sound and possible speaker mute
when the engine is on.


well anyways, once i unscrew those things and a SPLASH sound came out and
then some nice liquid came out

I say nice because it was like oil but it had that "new car" kindof smell

now as i am typing this and as i try to look up what kindof fluid it is
maybe it was oil but i don't know because it had that new car smell


well i got to thinking , why don't i just buy a rca ground isolator for
radio shack for 30 bucks

now you may be thinking that might just fix the symptom and not the problem

but then i got to thinkign, you see if i clean my ground wires all the
time with say brake cleaner and stuff, or if actual rain water gets on
the ground wires i am likely to get engine noise again

so i say i should just get the ground isolators from radio shack


oh btw, anyone have any clue on what feels like oil on the forearms but
has a "new car" like smell, please email me the info, i might need to
replace some of it