Re: Watermarks!!! How to remove...?
I feel for you mate! One year I went to Summernats with my black HDT Director and after the driving events washed the car. It was a stinking hot day and I couldn't chamois it off quick enough! I had white marks all over the car.
I tried getting the marks out with no joy but it was the first year or so of Meguiars coming to Oz and I parked my car at the Meguiars stand and they used it as a demo car for their products! The marks you are talking about are probably calcium and other mineral deposits from the water.
Not fun but you'll need a power buffer to save your arms and some good quality products. I'd suggest starting with 3M Perfect-It Glaze for dark cars using plenty of water in the 3M Dimpled buffing pad. Then progress to hand polishing using Meguiars Showcar Glaze with a final light coating of Meguiars Gold Class Wax. I've used this combo to win numerous concourse events and get into Top 80 Elite at the Summernats. By topping up the Gold Class Wax every two months or so (takes around 2 hours after washing the car) you shouldn't get staining again and the car will remain much easier to clean.
For the record, the 3M Perfect-It is the duck's guts for black cars and keeping swirl marks away.
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