Two other things I do to extend products:
Use foaming soap dispensers: just dilute your regular soap/shampoo by about third to half with boiled water (kill any bacteria!). Good to go!

Use pump sprayers: for all purpose cleaners, similar items you spray, use something like the Oil-O Pump (apparently at WalMarts as well as online) which will hugely extend the product as well as give better results because of the finer spray. To get closer to the "edge" use one of those 1-2 gallon spray pressure pumps usually used in the garden for insecticides (new, OF COURSE) to mix up and use concentrated floor cleaners. Again you'll extend the cleaner, it's easier to use, and does a better job.

Part of using such cleaners is knowing how they work: largely a matter of surrounding the dirt particles with cleaner and then suspending the dirt in the droplets. So finer droplets = more ability to surround!