Nice to hear from you again cleeds. How's the wife and kids?
No, pressing plants are not clean room and as I stated in a earlier post there is always some incidental dust on record and it varies a lot from almost nothing to painfully obvious. But, incidental dust can be brushed away with any good record brush. I use my sweep arm. The only problem with the sweep arm is when you lift it at the end of the record it will leave a little pile of dust in the runout area. I keep an Ortofon carbon brush handy to brush that away. As I have stated a million times there is no other environmental contamination that can be cleaned out of the grooves. Unfortunately, what happens I think is that the stampers become contaminated with dust so that by the end of the run they are stamping dust marks into the vinyl resulting in noisy records, then there is contaminated vinyl. I have tried over the years several times, in different ways including ultrasound to "clean" the noise away and it does not do anything. Since I only play records I purchased new and I use a sweep arm with a dust cover I hardly ever have to clean my stylus which is good because Lyra stylus cleaner is more expensive than gold.
I was just given a load of 78 rpm records so I have purchased a record cleaning machine. After studying the problem for 6 months I have ordered a Clearaudio Double Matrix Pro. Why? It uses fresh fluid for each cleaning and vacuums everything off the record leaving it bone dry and free of any contaminant. Air drying or blow drying are unacceptable. If you let distilled water dry on a flat dark surface you will see a residue. Distilled water is not contaminant free. the Pro cleans both sides at the same time and it is extremely well made. I will use it on a few noisy new records and see what happens. I will record a song to the computer both before and after cleaning to study the results. I have not had this capability before so this will be fun and informative. I hope you will enjoy seeing or hearing the results.