I've got alloy rims I believe are clearcoated. Up until I bought this car, I had no need to clean these type wheels.

The fronts have a small amount of brake dust and were rotated to the rear during a recent tire replacement.. and rears to front - which are now collecting brake dust.

Can anyone recommend a good spray-on / hose-off / no-scrub cleaner - I'm that lazy..

Quite often the no touch type cleaners are harsh and may eat away the clear coat.
Most Wheel cleaners will recommend that you test a small area, leave it on (not in sun)
and ensure it will not damage the finish. That is the safest way to deal with it.
My Pk Ave gets quite the build ups in the grooves, and I use a strong cleaner.
I still use a tooth brush quick in the real built up areas, and power wash them clean quickly.
Here in the photos you can see dirty & clean with Simoniz Heavy- Duty rim cleaner.


Now a good wax afterwards is needed, if you really want to keep them like new.

I like using Sonax wheel cleaner. It is safe to use on most types of rims like alloy, chrome, painted and aluminum.