I used to use Pledge exclusively until the visor on a Caberg helmet discolored. I couldn't be sure the Pledge was at fault, but all modern helmet mfgrs recommend using only dish soap and water. I picked-up a small spray bottle at WalMart, fill it with water and add a couple drops of Dawn...works a charm cutting oily residue and bugs. My riding buddies continue to use Pledge with no problems...oh well!
Twinz, Montpelier, VT
04 aprilia Futura, Ash Black - love it!
Gone but not forgotten:
'94 R1100RS, '84 R100CS, '76 R75/6 (S fairing)
'80 Guzzi V50 II, '73 Guzzi V7 Sport