Oil on the belly of the aircraft & the occasional streak around the cowl
, , , Bugs on the leading edge & struts . . . fingermarks around the
baggage door . . .
I use Turtlewax bug & tar remover in a trigger spray bottle - about
$4.00. - spray on, leave one minute and wipe off. So far has worked
really well and I haven't seen any negative side effects.
What do you use?
--
Tony Roberts
PP-ASEL
VFR OTT
Night
Almost Instrument 
Cessna 172H C-GICE