I LOVE my Leifheit click system tools. The mop is great. I can do most of my floors every morning in 10-15 minutes, and they are so shiny it makes me look like a domestic goddess when I am really dead lazy. The mop cloths are microfibre, so you don't need any chemicals, and you put them in the wash when you're done. I had been using a steam mop before this, but the Leifheit leaves the floors much cleaner.
Distilled white vinegar. Costs a lot less than spray cleaner, and is so much better for cleaning and for the environment. I have one spray bottle of it upstairs and one downstairs. Stops smelling about 10 minutes after use. I use it with Microfibre cloths. I use one a day, then shove it in the wash.
Bicarb. Combine with vinegar and you have a shiny sink paste! Go over with lemon juice for an extra clean.
Baby oil - put some on a microfibre cloth and use to clean stainless steel.
Wash up wiz (from Lakeland) - unlike a cloth or scourer, bits of washing up don't get stuck in it. So it's always lovely and clean.
All that should save you enough money on branded cleaners to buy:
Miele cat and dog hoover - does a terrific job on carpet, even with mucky cats.
Bissell carpet cleaner - a lifesaver for those moments when the cat sicks up the bloody entrails of a half-eaten mouse on the light cream bedroom carpet.