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craig,
If the White-Tac has taken your water spots off then they were almost certainly mineral deposits (essentially limescale), which is what I thought I had.
Claying did nothing for the marks on my motor though so I am convinced they are not "water spots" as such. The marks on my car are definitely NOT surface contaminants/mineral deposits.
Regarding using White-Tac. I thought the general consensus was that the reason to not use White/Blu-Tac is that it is not formulated to collect and then embed the particles it picks ups. I think detailing clays are designed so that they pick up the particles and then lift them away from the surface so that they dont induce marring as you continue to clay.
Obviously that could all be a load of tosh and I guess as long as you use enough lubricant you should avoid doing too much damage (where's Will when you need him?).
I woud be careful about using White-Tac and keep an eye on whether it is inducing marring or not.
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