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Humm yer washed it several times its faint but can still see it. Defo suncream must be some strong suncream water resistant maybe. I will have another go at cleaning it with the autoglym shampoo
Surprised it's not shifting then with just a wash. In that case, it might be worth polishing that part of the car again and re-waxing it. Tar remover and sealent/wax strippers will strip large areas (obviously) at a fairly uncontrolled rate, meaning you might have to redo the entire car. Try a little Super Resin Polish to get rid of the marks, then re wax.