Lots of good advice above, and I can echo the experiences of Jependleton, Nsgarch and Rauliruegas. I have experienced everything they said (except that I've never used Last, or Groove Glide either).
One more thing to try before you decide poor QC and poor vinyl is to blame: an enzyme based cleaner. Strange as it seems, even some newish records have biological contaminants. These usually sound like intermittent snaps, crackles and pops. A thorough dosing with Buggtussel Vinyl-Zyme removes most of them. Follow with RRL as a final step. You need Vinyl-Zyme in your cleaning arsenal anyway. While it's not common for new LP's to need it, it's virtually guaranteed that older ones will.
Good luck,
Doug
One more thing to try before you decide poor QC and poor vinyl is to blame: an enzyme based cleaner. Strange as it seems, even some newish records have biological contaminants. These usually sound like intermittent snaps, crackles and pops. A thorough dosing with Buggtussel Vinyl-Zyme removes most of them. Follow with RRL as a final step. You need Vinyl-Zyme in your cleaning arsenal anyway. While it's not common for new LP's to need it, it's virtually guaranteed that older ones will.
Good luck,
Doug