My boyfriend told me this one, when you get gloss paint on your hands rub it with olive oil and then wash off with washing up liquid.
Also I've got a load of tips to make glasses last longer if there are any other glasses wearers out there:
Wash gently with a little liquid hand soap and rinse under the tap, then leave to dry and just polish the watermarks off with the cleaning cloth.
Never use washing up liquid it can take the coatings off
Never use tissue its like microscopic sandpaper
Always take glasses off with both hands, don't swipe them off with one hand it will wear out the hinges.
If you prefer a soft case(I do cos its so much lighter) don't lie it down in your bag to get squashed, but stand it up