[dad911]

In my experience (hundreds of home inspections) the typical home inspectors point out what they (and you) can see, then the rest of the report is a disclaimer to cover their butt.

There are better products for sealing block and preventing further efflorescence.

If you have time, tape a large square of plastic on the wall then seeing if moisture builds up on the back will tell you if the problem is continuing. Best to figure out where the water is coming from. I've found it's usually grading and settlement near the house.

After it is removed (chemically) we used to use redguard (yes, for showers) and then paint over to seal. I have seen a product although made for radon, it soaks in and seals the pores for moisture also. Think it was called "radonseal plus"

The box-store products like drylock don't seem to be effective in the long run.