The Karcher one is fine, the new Karcher one is better

Always best to experiment with the amount of snowfoam used, depending on the size of your bottle try about an inch of snow foam and top the rest up with 'warm' water, see how it goes and try a little more or a little less to get whats right for you. (different snowfoams will give different results so using the same ratios for different products doesn't always work)

Also, try adding something like Megs Hyperwash to the snow foam and top up with warm water. Super foamy and extra cleaning all in one

If your going to be reapplying wax and want to strip back you can also add in some APC to the mix and remove the protection ready for the new layer/s..

before you use whatever mix you use, make sure and give it a bit of a shake...

Also well worth running some APC through the lance to clean it and rinse it out before you put it away to keep it nice and clean ready for next use...