Do you have pics of the spoiler you can show us? Maybe we might have suggestions as to what to do.
First suggestion, drive as fast as you can to dry it out. If that doesn't work go back to previous request.
13 HD FatBob
16 S6 Sepang/Black/Prestige/B&O/BlackOpt/DA/Sport ~ AluKreuz/Trans&Diff Inserts/USP Intake/RaceChip/15mm Spacers