For the litter tray I use Johnson's clean n safe litter tray cleaner (although I scrub the tray with washing up liquid first) from Pets at Home. With just one tray to clean, it lasts a long time.
For cleaning floors I tend to use a variety of floor wipes but I shut the door until it's dry so that the cats can't get it on their paws.
For general purpose cleaning I use Astonish paste which I get from Wilkinsons or Vinegar/water in a spray bottle (which I tend to buy ready made because I'm too lazy to do it myself). Sometimes I use dettol wipes because I like the smell of the pink grapefruit ones but I make sure the cats don't walk on surfaces I've wiped with those until they're dry as I'm not confident they are ok for pets.