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Soak thoroughly using cloth soaked in WD40,hold on all areas for about a good minute.
Wipe off as much as will shift,then use a clay bar if you have one followed with good polish will see area clean,then apply several coats of a good wax/sealant to stop it happening so quick next time.
I always wipe with a wet wipe when i return from a motorway/long trip at this time of year,as when they build up it's a bit of a job.
If paint work well protected,they don't stick to car as well.
I've been using just normal halfords turtle wax stuff or autoglym shampoo on the rare occasion. Dont know too much about shampoo's. The wd40 trick worked a treat though then tcut was decent too. Im still to use the clay bar and wax as i havnt bought them yet lol. Also not getting good enough weather to spend a day cleaning. Cheers for help