Simoniz

[Perfectlap]

Sonus Green is very very soft clay. Many have complained it's too soft.
You have to use a nice size clump otherwise it will break apart. a bit extra lubrication is not a bad idea.
I don't think you'll get any benefit from waxing the car for storage. Probably do more harm than good. If you don't need to touch the paint, don't. Leaving it as is after claying is not a bad idea. Sometimes debris will sit too long on the paint and etch tiny dimples into the clear coat when it finnaly removed.
If you want it to sparkle in the garage, I might try a less invasive spray wax like your NXT spray which last forever. Very good stuff for an over the counter product.
Spray the panel and the towel before touch the paint, always.

and the Klasse All in One(which has a new eco friendly formula--mixed reviews) is not a substitute for claying, just a great paint cleaner. The car should be clayed before rubbing on the paint no matter what product is used. If you want to go one better after claying on an older vehicle try a decontamination kit like FK1.
Claying dislodges debris but sometimes the debris is below the surface, a decon kit will flush out ferrous particles and chemicals contaminants from swirl channels that cut their way down to the base layer, which leads to rust.