Rain-X Headlight Restorer Treatment, model 800001810 (Amazon ASIN B0049GI418)

Cloudy headlights make a dark county road feel darker, and this is an inexpensive first thing to try. Amazon has Rain-X Headlight Restorer (model 800001810) for $7.87, down from its $10.99 list price. You put the liquid on a damp cloth or right on the lens, wipe, rinse and dry; no tools needed. Know what it's for, though: the listing says it's designed for lightly yellowed or cloudy lenses and works best as upkeep or after a full restoration kit, so badly yellowed headlights still call for the kit. It's rated 3.9 out of 5 across more than 2,700 ratings. As of Tuesday morning it was in stock, shipped and sold by Amazon itself. Without Prime, free delivery starts at $35, so it makes the most sense added to a bigger order. Prices move, so confirm the total in your cart.