Surface Noise - advice/thoughts
 

Recently acquired a few LP's via Discogs - followed usual process - clean in the trusty SpinClean with Tergikleen fluid and distilled water rinse, use an antistatic brush (Furutech ASB-1, bought here in AA).

All discs visually perfect to the unaided eye.

3 of 4 play beautifully, one has pronounced surface noise/pops (no skips or other issues).

Bad pressing?

Sounds like a bad pressing to me.