I use 6x4" stock cards and always have, each card has a plastic sleeve and the sleeves go into a small photo album.
This is a really simple method of recording the days work.Each square represents a clean, If they pay they get a / if they'r out they get a 0, when they do pay they get the 0 struck over with a /. if they are not done for any reason they get a _.
if they pay in advance you put a tick in the amount of squares paid.
I always do the more lucrative commercial stuff on time, the domestic get done where ever they are on the rota, if I have a few days off, I start back with the next on the list.