It has just occurred to me that a floor mopping robot would probably change my life, but I need to know if one would really work for me as it would be a huge expense. Advice please! Sorry this is so long and boring but it honestly would change my life to have a reasonably clean floor most of the time, I'd feel so much more like I was really !
I've got SPD and find that mopping, sweeping, hoovering, raking and other things involving the same sort of range of repeated pushing/twisting/bending movements can set off pain or exacerbate existing pain. This is especially bad later in the day, so when the toddler is finally in bed out of the way is when I least want to have to clean a floor. Single parent so noone to help.
I have two largeish rooms downstairs, one with cheap laminate and one with lino. I have a toddler and a cat. The external door we use most opens straight onto the kitchen, right in front of the oven and at right angles to the sink (diagram on request 
), so if we bring mud in there is no way of containing it very much at all and it very easily gets trodden around the whole of downstairs, including all over the sofas. Which are white. Yeah I know.
Would a robot mop cope with a bit of mud, if I picked up the obvious larger things like actual clods and leaves etc?
On mud, would it end up just spreading it around unless I changed the cloth every few feet? How often do you have to change the cloth?
Do they cope ok with sand?
Do they wipe the water back off the floor behind them, or do they leave the floor wet to dry naturally?
Will cheap, badly fitted laminate cope ok with this over a couple of years (it will need replacing in a couple of years anyway)?
Do they really get into the corners properly, and mop around things like table legs?
Is it vital that I wait for mud to dry, then run it on a vaccuum cleaning setting, then only run a wet mop setting after that? Or could I run it wet on the most-used bits of floor regularly and only use the dry vac once a week to get in all the corners for cat hair?
Anything else I should know before I completely blow my budget?
Thank you!