10p more than vassy4u found (now expired) - but still seems very cheap considering you can have delivered for free via DHL!
Use code WEEKEND30 to reduce price to £2.44 (Claims the voucher expires 08/01, but still works - tested today at 13:35)
Triple QX Concentrated All Season Screenwash cleans all types of dirt, grim, tar and sap from your windows, leaving a spotless, and streak clear finish. The concentrated formula allows you to get up to 20litres from a single bottle, meaning excellent value for money!
Free delivery / Free click & collect