if you sold your round , you will be sitting around a lot, you have to go get the work and stand out from the rest. do it part time, do all you can to get work pw trial it for 6 months, KEEP YOUR WINDOW CLEANING ROUND.
it would be harder starting window cleaning again if you sold it.
post an add on gumtree, lots of people out there will bite your hand off for work p/t. pay them when needed basis, dont employ them, let them claim there working hours. and the rest.let them work on a self employed basis.
if you do wfp cleaning more easier for them.
when you trust them you can leave them to do windows same wage, giving you time to do pw work.