Yup, just a damp cloth for the sinks and such or if it's the shower or other things that need something a little more heavy duty, I'll use one of those sponges with a plastic scouring side to it. I reckon you can leave out the borax. As long as you have the washing soda in there, the borax is pretty much overkill anyway from what I've read, so just washing soda along with the rest should be enough to do the trick. If you want to add some extra scrub to it, you can add some ordinary table salt, too.
(If you can't get borax where you live, and neither can I here, you can get it online at intralabs.co.uk and they'll gladly send it.)
You can just make a teensy batch of a couple of tablespoons and see how it works for you. I have pretty soft water here, so I don't have scale to worry about, but if you do, you can dampen the cloth with vinegar instead of water.