Prevent your car windows fogging up this autumn with one everyday household itemThis genius and cheap hack involves one common item and a sock. ‌Drivers across the UK are familiar with the frustration of misty car windows. Car and van dealership, Swansway Motor Group, has revealed how a sock filled with cat litter can help stop windows from fogging up, offering a low-cost and effective way to keep your car windows clear throughout autumn and winter, reported Wales Online. However, there's a simple little trick that can prevent this – using cat litter." But the cat litter trick can also help with this pesky winter problem.