I paid £40k for the goodwill of a off licence/general dealers store. A store that opened 5.30am till 10pm. I lived above it and IT ran my life!!!!!!
I could only dream of earning what your window round is bringing in for you! I bet you are not starting at 5.30 and on the glass till 10pm.
IF I knew then what i do now regarding window cleaning and you where in my area I would be finding 50k to give you.
Taking over someone elses window cleaning business if done right should see good customer retention.
I paid for goodwill on a shop. The customers did not have a contract with the owner i bought it off 'only to shop with him'
GET MY POINT!
Good luck and hope you get your asking price