Hi Wayne its best to pay them when you cleaned them you may find yourself constantly motivating them as they won't be over the moon to go out to work I normally found , example is a decent person might go out and get say 10 leads out of those say 6 to be cleaned so you owe him £30 its not enough to keep someone interested or take it seriously , unless you are thinking of paying for a name and number that way it would make a difference as getting a lead who has an interest in using you at some stage isn't too hard but getting Immediate jobs is so paying them for just leads at a fiver will keep em going I guess even if Half of the customers use you that's still only £10 per clean if your average clean is more then £10 you can't go wrong play it by ear if you want them to work regularly if they can earn 50-70 quid a day that will keep em motivated