Seen this recommended by a few on the forum and was not sure if this is a good deal or not.
I dropped the Saab into Halfrauds for an MOT this morning (passed with no attempt to persuade me to do advisory work of deteriorating CV boot other than suggesting it would be needed before next year - they still seem to be improving). Went for a wander around the retail park while waiting and in B&Q saw Rain-X at 'half price' reduced from £14.36 to £7.18 for 500ml bottle of '2 in 1 cleaner and repellant'. Decided I could do without it! Then went into Asda for a few bits and saw the same thing for £4! No idea how much it should be but I have bought one to try. Just looked on Amazon and it seems to be £8+ so might be a good buy if you are interested.