Like @grislybutter I am interested to know how many here hear contamination and surface noise on most of their records. @juanmanuelfangioii says he cleans every record each time he plays it - Juan Manuel, why not play one without cleaning first and see if you hear noise.
I have used a Nitty Gritty for many years. If I hear noise when playing a disc, I clean that disc. I then put it in a fresh Nagaoka inner sleeve so I know I've cleaned it. I guess I have cleaned about 25% of my LPs, most of which were purchased used.
Do you know what? I hardly ever hear noise again on the cleaned records. I have very rarely had to clean one a second time.
Don't be obsessive. If you can't hear noise, why worry? It might be said that contamination at a level that cannot be heard might damage the records. Well I have had some for over 60 years and see and hear no damage.