I think things have moved on a bit from the days of “that’ll T-Cut out” t-cut became a bit of a joke and these days the shelves of halfords are full of all sorts of better alternativesI haven't seen anyone mention T-Cut. I use this once a year just before the MOT is due. The T-Cut I'm using is a lot older than the 5 years I've owned the car, it was bought for a previous car and is the wrong colour for my present car's paintwork. It takes just a few drops and a few minutes of rubbing with an old rag then a buff with a clean rag to get the headlights sparkling.