Recently you had a question about sun cream removal from car paintwork. With 3 young children I've had a lot of experience with this. At first I tried hot soapy water, T-Cut, clay bars - nothing would touch it. Eventually I asked my local body shop and they recommended Farecla G3 Advanced Liquid Compound. It removed the stains in seconds. It's about £13 for 500ml, this amount should last a lifetime. As always, don't rub too hard for too long.