Best Boat Cleaner (preferably spray on, spray off)

There are plenty of products that will clean but to do what you are asking without any scrubbing they will all be very abrasive and contain acid. Not recommended for the long term care of your boat.

Is this for the inside or outside of the boat?

Best thing I can recommend to make washing easier is to maintain a coat of polish, wash, or ceramic. I use starbrite polish on mine in place of wax and it washes pretty easily with minimal scrubbing.

Starbrite Non Skid Deck cleaner is what you are looking for

I use starbrite nonskid deck cleaner and it works great but it still requires a good bit of scrubbing with a stiff bristle deck brush. Op is asking for something that can be sprayed on and washed off with no scrubbing.

I have a Pathfinder 2200, White deck of course, I used to have to get the pressure washer after every fishing trip because of blood stains /gut stains whatever being so hard to get out. I spent two days in the garage-- first thing I did was use purple Power with a variable speed buffer and buffed the entire deck and floor, (everything above the rub rail), when I was done it looked like a brand new boat. The second day I used a spray wax (might have been Starbright but I don't remember), and I spray waxed the entire deck and floor. That was probably 3 years ago and I still only have to spray it down with water after fishing trips, all the blood and other stains easily rinse right off.

Eta: then all the skin peeled off my hands for the next week. That purple cleaner is some serious shite.

Booyah boat cleaner is pretty good

Anything Starbrite will be good

I have seen some adds for some “machine cleaner” forget the brand name. Looks like it will remove just about anything

FRS gel works ok. Need to scrub and rense off after

comet and a soft brush and then wax it well

Just be warned non skid still is slippery when wet.

FSR but you'll need to rewax after. Nothing works better on waterline stains.