shadow85- Getting glass cleaner on the (LSPed) paint is a big concern of mine, so...well, I'm just really careful about how I spray it, especially when I use an aerosol such as Zep40. This is overspray issue is such a concern for me that I just don't use many aerosol products (no tire/trim treatments, etc.) and I'm kinda particular about how my spray nozzles pattern.
Overall, IME it's just not *that* hard to avoid the overspray, but again, gotta use the right spray nozzle and have it adjusted properly. Eh, don't mean to trivialize the concern...guess I've been working at this for many decades now and I've finally gotten the hang of it.
When working outside in windy conditions, I'll spray the Window Cleaner onto my cleaning medium instead of risking overspray, even though I consider that an inferior way of doing the job.