Flavourless and odourless leads me to think only one of 3 things:
Rainwater dripping out of the undertray
Washer water from a punctured hose
Water from the aircon system
1 & 3 are irellevant and 2 is unlikely given where the hoses are located (behind the grille), but the only one I can see fitting the bill given damage.
I'd check washer bottle and rad levels and see which if any gets lower. If not forget it.