We havent had that big an increase, but have only lost 4 customers this past 3 years directly down to recession tightening cut backs. And thats with me regularly offering to stop going or decrease frequency!!

Would never make a salesman, me!
On the other hand in that time we have picked up probably well over 25/30 new, more profitable customers.
Our main causes are for loosing customers are in descending order:
Death 50%
Moving 45%
Other excuse 3% *
But as has been said, do a good job, be friendly, and wont do too bad, for some reason having clean windows seems to be high up on their list of priorities still!
*2% margin for error