Asda are having a 'cleaning week' - lots of cleaning products significantly reduced. I just got Domestos at 2 for £1, same for Fairy Liquid. Also Flash surface cleaner reduced from £1.60 to 2 for a £1. Lots of other offers as well - see the link.
Flash surface cleaner
All available on line or in store.
Edit - link doesn't show all offers - included were fairy Dishwasher tablets - £4 for 42 and also Lenor Concentrate - reduced to £1 from £1.88