I must get this question at this time of year up to 30 times a day. I do try to reply to you but sometimes a blog post can give you so much more information then a quick answer.
Suncream can be a real pain to get out and the longer you leave it the worse it is going to get. If you are out and about when the stain occurs you are naturally going to wipe the stain with a tissue or a wet wipe but the heat from the sun and perspiration can activate the grease even more making it much worse.
Try to prevent Suncream stains always rub the suncream into your skin really well and wash your hands straight after application. If you are travelling with suncream always place it in a safe secure plastic travel pouch bag or place inside two carrier bags and wrap tight. There is nothing worse than getting to you destination opening your suitcase to burst suncream.
As soon as you can rinse the stain from the reverse under a cold water tap. This way you are trying to flush the stain out. Then fill a washing up bowl or a sink with hot water and about 25ml of white wine vinegar. Next, wash the garment in the hottest temperature that is safe for the fabric and the check for the stain again before you dry. Once the item has dried you will won’t get the stain out. So if there is still a trace of the stain repeat this process again. When an item of clothing has had a grease based stain avoid the tumble dryer because if there is any trace of the stain it will then be permanent.
I would air dry on the washing line or on a clothes airer.
If you are due to travel soon then don’t forget my Holiday organisational planners which can help with your packing and ensure all those needed jobs are done before you travel.