When soft plastic sits in the sun too long, it tends to go sticky and blotchy, which leaves a mess on topsides and is horrible to handle. But there’s a cheap solution. Buy the cheapest cola you can find and soak the plastic item – like a clutch – in it for a number of weeks. Then rinse. The acid in the cola will dissolve the stickiness, leaving you with clean, if slightly faded, plastics.