Haha, I had the same problem when I first got the car, it pissed me off so bad, I ended up making about 5 trips to mazda. And everytime they would just replace the nozzle or something. Finally I took one of the mechanics for a ride to show him, he told me it's not a race car, and that he'll fix it, so the next day I return and, unbelievably, it's fixed. So here's what they did; The washer fluid container is located up front, on the passenger side of the engine, it's shared with the front window washer too, the hose for the back washer is routed through the a pillar and makes it's way to the back running along the roof, no here is where the problem lies, if you notice the nozzle is at a lower position than the hose, so natrualy it tends to drip out under acceleration. What Mazda did with my vehicle is re routed the hose along the bottom of the car, like where the electronics for the rear tail light etc. It solved the problem, I think Mazda is trying to avoid a recall but when I showed up with the problem they said they never heard of it. who knows??? Anyway, thats how to do it.