:shead:Try using Vinager, let it soak ang agitate. Chemical guys has a good water spot remover.:applause2: Good Luck...:chips:
ONR is good just dry it right away. If the spots are there, DG 501 will remove them no problem. Be cautious using anything more abrasive than that or it will scratch.
I get them on my wife's BMW. I think the best way to handle it is to assist drying using a leaf blower.
I would suggest buying your DG products straight from DG. They have a flat $5 shipping regardless of the size of the order and the big thing is the stock is fresh.