Dai i work with sea spray all the time as i live and work on the coast ,with normal squeegieng you just wet the windows down with a lot more water than usual on your applicater .and make sure you change your rubber everyday .then you are less likely to see fine lines wich realy are highlighted with salt spray.
and the customers can realy tell when there windows have been done .so they are more than happy .
with wfp i have done a few now ,and i only had trouble with one in direct sunlight on a realy hot day and that was easily sorted by turning up the flow rate and extra rinsing.one of the advantages with salt spray is that you can actually see the water running milky down the pane and just wait for it to run clear and when it does just give it a quick final rinse then bob`b your uncle .
dave