(m)Some pre-wax cleaners use chemical
and/or abrasives to clean
(p)I would say that all products of this class use chemical methods to clean. They will be oily emulsions.
Once you add any abrasive, we would class
it as being a polish, not a cleanser.
Even if it only 'polishes' and does not 'correct',
it is still mechanically abrading the surface and
the term 'polishes' should be interpreted as it
being a polish, not a cleanser.
(m)Some also have fillers in them too
(p)As above, once you add fillers, it isn't a
cleanser any more. It now becomes a glaze
(or an all in one, if you have abrasive present).
If you think about it, it cannot be a cleanser
because those fillers will leave something behind
and thus the surface really can't be considered 'clean'.
(m)All pre-wax cleaners will lift embedded dirt
from the pores of the paint surface, and all will
remove polishing oils and/or a wax or sealant LSP
(p)Given that a prewax cleanser is basically a polish without abrasives, it will present the same issue of residual oils as the polish will. Unless the product is using highly volatile oil content (which would be a new one on me), the oils in the cleanser are going to be there, why are they going to magically disappear when the oils in a polish won't? In terms of stripping, if it is a cleanser, without abrasive, then you cannot guarantee that it will remove an LSP, especially if you are working by hand. Even some of our quick detailers can survive a cleanser when worked by hand. If it has abrasives, then the story changes but then it is not a cleanser, but a polish.
Again, this applies to the creamy type products, not to an IPA/panel wipe type product. I was going to spell out the hierarchy of this product type but I am going to keep it under my hat as it occurs that the confusion that many brands create might mean that they don't get it either (and I am not inclined to help!).