You're wise to take care with your record collection. Microcare Premier in a spray can does a fine job removing mold release from older LPs. However it cannot serve as the sole cleaner in your arsenal. Minimally the Premier should be followed by a pure water rinse. For optimal results consider the Walker Prelude system with final rinse - imo, this is current state of the art in record cleaning kit. A bit pricey, but it definitely does the job.
If your 'Needle Doctor' is a vacuum machine similar to the Record Doctor sold by Audio Advisor, do not give it up just yet. Try it with the Prelude system or similar - the machine is a bit of work, but keep its felt lips clean and it will reward the effort with effect vacuuming. I used one for many years before spending more dinero on a Loricraft, and they work fine for a small collection.
Tim
If your 'Needle Doctor' is a vacuum machine similar to the Record Doctor sold by Audio Advisor, do not give it up just yet. Try it with the Prelude system or similar - the machine is a bit of work, but keep its felt lips clean and it will reward the effort with effect vacuuming. I used one for many years before spending more dinero on a Loricraft, and they work fine for a small collection.
Tim