There is one simple foolproof way that I have used for years, all you need is a pack of 6"x4" ruled stock cards and a pen.
The cards already have lines on them, you just need to draw in some faint columns.
write the street name or area on the top of the card.
Draw one column top to bottom for the house numbers.
The next column has to be wider to write down the customers name and phone number.
The third column is the price for the job.
the rest of the columns are narrow, in fact when you draw them you have little squares.
When you go round you put a tick in the square if they pay, or a 0 if they don't, when they do pay, you strike through the 0 with a tick. If they don't have them done then I put a ---.
You can put the date they are done above that months squares.
I get a years work on one card, and the cards are kept in a 6x4 photo album.
This method is so simple, and you fill the card as you do the job.
Even if you use george or a spread sheet, you still have to have some record of who paid or didn't as you go along throughout the day.