We're testing it with one house and one commercial account. So far no missed payments, but only about 3 months in on both.
Residential account had us back twice in 6 months for about $800 worth of work so we took $100 for the last job and $39/month for 11 months with one more guaranteed wash within a 12 month period. We washed the house last time. The next one they can call us back to wash the house or anything else on the property. If they want a 3rd service in that 12 month period it's at a discount of 20% from our flat rates.
Hell. I'll wash their cat if they want. Awesome folks.
The commercial job just pays us a each month for their quarterly service. Trying to figure out how to sweeten the deal on this one so more commercial accounts jump on board.
We also split residential projects of $1000 or more into 3 payments at an 8% "interest rate" or 6% for 2 payments. For that to even be an option we have to have done work for them at least once before or they need to have been referred by another customer.