And now for quite a different liquid... Now that it is starting to hot up for those of us in the northern hemisphere, this seemed a good time to recommend a product that I've discovered relatively recently which really does seem to be superior.
Our older daughter is very prone to sunburn and introduced us to this great Danish sun lotion 18 months ago, since which time no-one in our family has suffered at all, even in strong, hot sunshine.
You put the colourless SPF 20 (medium protection) liquid on once a day, wait 15 minutes before going into the sun, and that one application lasts for 10 hours. Reimann P20 is not cheap - about £12.50 for 100ml or £23.50 for 200ml – but probably works out to be no more expensive than any other sun cream or lotion because you put it on so rarely.
I see that you can buy it at up to more than 30% off here - though it's difficult to see who would want to buy 1.8 litres of it at a time.