Ok so i did the claybar and wax this weekend and the car looks great! But i still have a few concerns. The entire job from washing until waxing was complete took about 3 hrs. I assume it will go faster next time.

First, i washed the waterspotted areas with the vinegar/water mix. Unfortunately it didnt help at all. After scratching vigerously with my fingernail i was finally able to get about one square centimeter to come off a little bit. With as much pressure as i was applying i was affraid my fingernail might actually scratch the finish, not to mention how long it took for that one small area...so i stopped. Im still open for ideas. Someone mentioned wet sanding?

My technique was just rubbing the flattened clay back and forth over and over. I probably did any given spot 5-10 times just to make sure i didnt miss anything. I dont know if thats really necessary or if its overkill. The hood and the roof were the dirtiest spots, the clay came back yellow with little brown specs. So it was obviously working.

I used both claybars since half way through the job i had already flipped and kneaded the clay a few times and it was getting dirty. Am i supposed to dispose of the used clay? That seems like a waste but i cant see reusing it.

I thought i remembered reading that some people put a plastic sandwich bag on their hand to check for smoothness to see if the paint is really clean. I tried this method and oddly the car didnt feel smooth, it even left a few light scratches, but they luckily came out with the waxing. After thinkning i overdid the claybar step, im confused as to why this happened. I swear it felt smooth without the plastic bag....

Oh, and is it ok to just wash out the foam wax applicator or should i just buy a new one each time?

So...im still a detailing noob but i think im comming along pretty well. Any more advice on some of the above issues its greatly appreciated.