Yes you can get it in B+Q or Homebase, what I will say is don't be tempted to buy their window cleaning gear as its useless
and for home use only, buy from a window cleaning supplier.
Spray bottle isn't great as its too slow and doesn't put enough liquid on the glass especially on a hot day, soak the mop in your bucket, wring it out slightly so as its not dripping all over the place, put it into your boab and away you go, just use the mop to catch the liquid again as you squeegee it off the glass and it will last a good while before you need to return to the bucket which you can leave sitting on the kitchen sick or similar if your fearful of spilling the contents.