I have known a few lads in the past who have started window cleaning but its just not worked out for them. Granted, window cleaning is not rocket science, but it does take some specific skills, ie you have to be a people person, have to be self-motivated, able to work on your own and not easily bored.
Sometimes I think for some people it just aint the right job, no matter how wonderful anyone else thinks it is. It takes maturity to admit that the job you're in is not right for you, and courage to then move onto something else.
May sound harsh, but IMO if someone has not made a successful window cleaning business (and by that I mean they're earning a decent wage and have enough work) after a year, then the chances are they are probably not cut out for it. There's nothing wrong with that though, they could be perfectly suited to something else.
But for the meantime, the best advice I can give is, get up early, always start at 9am sharp. That has been a firm rule I have imposed on myself, and it has always served me well. I know of too many lads who lay in bed till ten then dont get started till 11 then wonder why they have no money. IMO an early start is the key to good motivation.