I nearly got into a tiff with one of my custies.. she said id done such a good job, doing a 3 story inside and out, she wanted to pay extra as i had under charged her for the extra hour i was there..
.. i didn;t mind doing the extra hour free as i was going home cos it was absolutely peeing it down, so the rest of the day would have been a wash out anyway, so i was just taking my time..
I said no so many times, but she insisted and was basically pushing the money at me.. i eventually took the extra money.. but i was happy not too... although every penny helps

I always accept extra money from old ladies if they offer - i always ask if they are sure, and not living themselves short..i dont always charge them the right price anyway.. some times they ask if i can come in and clean the inside of the kitchen and living room windows - which i will do for free if im not in a rush.. so that tip helps pay for the internal when i dont ask for anything more.