Starting a Classical Vinyl Music Collection

"I used the Ultra Sonic $6,499.99 Klaudio Cleaner with poor results"

No RCM will eliminate prior groove damage. If you can't "test play" a used LP, then it's simply  luck of the draw. There are used LP's that can look awful/superficial scuffs  but play fine or LP's that appear perfect and sound terrible. YMMV.

Depending on the stylus  profile, an LP may be noisy on a generic elliptical,yet silent on more advanced. Not always the case, but possible. 

I often find 50-60 year old Classical LP's, use the VERY LOW TECH Spin Clean and they play quite nice. I get those US cleaned and..close to absolute silence. 

Classical is the arguably the best genre to  collect used LP's.

Typically cared for, less in demand. Depending where you're at, Goodwill and record stores that bother with Classical will have gems for cheap.

50's and early 60's are the peak of the LP production.

Do your Classical music history homework. Learn about the genres and eras which will help you understand what it's all about.

Find/discover your top 5 composers and their "must have compositions."

Endless choices.

"I tried the Hummingguru  with the same problem.  Same static and pops"

Do you have ANY albums that are quiet to eliminate the cartridge/stylus or phonostage being part of the problem?

If you do have quiet LP's,  then it's back to groove damage. That or there's something else going on not  being discussed. 

I can't be the only one finding quiet used Classical and NOT owning a proper RCM.