We would recommend Osram Night Breakers or Phillips RacingVision bulb upgrades, as they offer superior performance in low light conditions. The bulbs are designed and approved for use in the EU and as long as you purchase the right fitment for your vehicle you should experience no issues with excessive heat.

If you have had no success with a cleaning kit, you could try this Meguiar's kit www.halfords.com/motoring/car-cleaning/clay-bars/m...l - it contains a comprehensive kit of products including components designed for stubborn defects, and although it is a little more expensive it is far cheaper than replacing the headlights completely.