I have a few of these, having been a soft touch in the past. A couple of them have even had the neck to ask me to clean for them again, even though it is over a year since I dumped them!
I always say that when they pay me up in full and in advance, I will go ahead. Strangely, their interest seems to vanish at that point!
It stresses me out dealing with these 'excuses formerly known as customers', so I just let them go and become someone else's problem!
John