Send individually, never as a blast. Expect three to six yeses from twenty. Copy the shape, set your own launch number.
"Hey, I'm starting a mobile detailing business and I'm booking my first two weeks. I'm doing full details at a launch price of $ for people I know, since I'm building up my before-and-after photos and reviews. Normal price will be $+. Your car, your driveway, this month. Want a spot?"
Source message used a $99 launch price against a $175+ normal price. Three things do the work: a real price later, a stated reason for the discount (photos and reviews), and a deadline.
Names the number, ties it to what the customer gets, does not apologize.
"Looking at the photos you sent, the pet hair goes past what a standard detail covers, so this lands at $ instead of $. That covers the extra hour with the proper tools, and honestly it's the difference between doing it right and doing it twice. Want me to hold Saturday morning for it?"
If they say the other guy is cheaper: "He may be. My price is what it costs to get it done right and to have me insured, documented, and accountable if anything goes wrong." Some walk. Let them.
Delivered at the handoff of a good detail. Arithmetic, not pressure.
"You just paid $ for this. On the monthly plan it's $ a visit and the car never gets back to where it was today, which also makes each visit faster."
Plan tiers from the course: Essentials every 2 weeks, $75–$100 per visit billed monthly; Monthly detail, $130–$175 per visit billed monthly. Card on file, charged the same day each month; cancellation any time before the next billing date, said out loud.
Four beats: walk them around the car narrating two specifics, hand them the keys, say the ask, send the link while you are standing there.
"If you're happy with it, a Google review makes a huge difference for a new business. I'll text you the link right now so it's one tap. And if you know one person whose car needs this, I take good care of referrals."
Backed by the timestamped video from the pre-job lap. Non-defensive, factual.
"I want to show you something and be straight with you. This mark is on the video I took before I started, here's the timestamp. I document every car at pickup for exactly this reason, so you never have to wonder and neither do I."
When you actually cause damage: say so the same day, show the customer, name the fix, pay for it properly. One owned mistake is survivable; one concealed mistake is terminal.
"Booked: package on , arrival window . Price $, deposit $ (non-refundable inside 48 hours). Please have the car accessible and an outdoor spigot available if you have one."
Deposit rules from the course: card-on-file or a $25 deposit to book, non-refundable inside 48 hours for standard jobs; 25–50% down on any protection work over $300. Easiest at booking, hardest at the door.