How do you remove hard water stains from a car?

White vinegar is the usually the best method for removing hard water stains. When it comes to cars however it must be noted that the vinegar is acidic and care it must be taken not to damage the paintwork.

A diluted solution of 2:1 ratio of white vinegar and water is very effective in this case and if rinsed off thoroughly with clean water it removes hard water stains in no time.