First I know that this may well be a wild goose chase for most, and maybe store specific to just my local in County Durham (Bishop Auckland branch) but:
Vanish Gold Oxi Action 1.4kg (1410g) tub, both in the standard pink tub or the one specifically for white were reduced £12.00 down to 50p.
As per the image it's on a sale sticker and this was located on the end of the aisle near the bakery section bizarrely.
I have no idea of this size tub is being sold off, if a new label design is on its way, or if Sainsbury's have just cocked up, but on the next aisle was the exact same product in the 940ml size tub. This was on 'offer' for £7.00, reduced from £9..
What's shown on the picture was what was left on the shelf. It may help someone! I grabbed two of each which should last a while.
Fill your boots if you can!