I think it would take a very clever person for anyone to successfully launder drug money through a visible business such as window cleaning.
I would have to do about 80 extra jobs to cover another £1000.
It would be easy to launder drug money through window cleaning, but i don't think it would survive any scrutiny.
Besides, if you spend any dodgy money on material things they will only be taken way. What's the point.
Buy an education, training, a moment or an experience instead.
No-one can ever take that away.