God only knows why you let them go so long cleaning without being paid?
I bet they get their salaries each month, without fail. I can also imagine the uproar they would make if it's their benefits that have not been paid.
Toughen up, don't be so nice. To succeed in this game you have to dump and replace messers and bad payers and increase your prices regularly.
No offence bud but if you don'[t value your service, the messers never will.
And I'm not
Joe King. 
Ha ha, I'm not unsuccessful! I'm young and have built a decent sized round, much better than all me mates earning diddly squat in 9-5 office jobs,
Don't get me wrong there's room for a lot more custys, hence giving these a chance,
I've been round many times to collect, so it's not a case of toughening up, because I know all that'll happen is they'll refuse to answer the door completely if I give them attitude or a demanding tone, I'll keep probing, and if unsuccessful tell them to pay and I'll no longer do it,
There's no easy way of going about it, all I can do is wait and keep asking, ill get it eventually, determined too!
I did not mean to kick you in the nads.
I was replying to the fact you were asking what to do coupled with the fact £50 would be better in your bank.
Toughen up means don't keep messers, drop them. (not threaten them.)
"Been round collecting many times" is adding to the debt and wasteing mo9re of your time and energy
Hey, no worries. Its your business run it how you see fit.
Yeah I see your points, but they don't particularly help me get the money, I will drop them if they don't show me they are competent enough to pay, but in the mean time I just want the money,
In the end it's there wallets they've gotta dig into, all I can do it seems is knock and ask, then, when I finally get the money ill probably say to them 'do you think it's best I leave you off the list, and perhaps only do your house if you have the cash on you and pay me on the day...'
I do a lot of houses in there estate, so it's no bother driving round there, as I'm there collecting each month anyway, likewise its not much bother spending 10 mins cleaning them, I'm there anyway.
It'll all work out, the beauty of window cleaning is we have a multitude of customers who do pay, so I won't go hungry over these two duffers, - just a bit frustrating...
Hey ho, tomorrow's gonna be a cold day, lets all save the energy for that!
Peace be with you joe

no hard feelings...