£12 for a car valet and polish worth £35 at Car Spa - save 66%Need to know: Save 66% on a car valet and polish; Get your motor looking spick and span for less; Available at two branches - Cardiff centre and Caerphilly; What & why: Now that all the snow has either disappeared or turned to brown slush, the state of your motor is all the more noticeable. Luckily for you, though, we've got the perfect solution. And it's not a bucket and sponge. For just £12 you can treat your car to a fantastic…