Why? It could've just been someone with fucked wiper jets trying desperately to get some fluid on their windscreen. Unless they were actually squeezing a bottle of fluid on you... kinky.
I've seen people in motors doing it to other people on bikes, and it's happened to me before...and it's a shitty thing to do at best. At worst it's assaulting someone with stagnant and bacteria ridden gloop.
Why? It could've just been someone with fucked wiper jets trying desperately to get some fluid on their windscreen. Unless they were actually squeezing a bottle of fluid on you... kinky.