When someone sends you a cheque keep a record of the account number (allow for 2 accounts per customer) and address in a spreadsheet. That way if you receive a cheque and you don't know who it's from, when you enter the first few digits on a spreadsheet 'search', the address will automatically pop up. I always write the address & date of clean on the inside of the SAE I leave for each customer as it keeps the bookwork simple.
