I always get sore back and arms from cleaning the tub and the full tiled alcove around it - I have RSI and other issues, and the tub is awkwardly positioned. So I have just bought a battery powered electric scrub sort of tool, that might make it easier to do it more regularly and to do the tiles as well, as I avoid doing it for ages (it's just me here, so it really doesn't get that dirty!)
It does get covered in soap scum/limescale, though, both the tiles and bath itself, so I thought this might help as it's got a long extension and I should be able to reach all the tiles.
But what kind of cleaner to use - I'm not likely to want to use the tool to rinse everything, so either I need something that doesn't need rinsing, or that I can just turn the shower head on, though there isn't a shower screen over half the area so it would be hard to do without getting water everywhere! Normally I've been using Cif or similar foamy bathroom cleaner, spraying it on the tub (ignoring the tiles most of the time!) and then sponging off and rinsing a few times with the sponge, but maybe there's something better and that would be easier to spray on all the tiles even where I can't really reach.