Solar collectors to maximum!
I was tempted to buy this, but it's $190. Too much.
The Grocery Shrink Ray has struck again. The old version, on the left, was 400 mL and 250 "pumps", while the current version has shrunk to 300 mL and only 190 pumps. (Fortunately, I know how to refill these bottles cheaply. Just mix at least 10 parts warm water with 1 part dishwashing detergent.)