I've been using a basic Nitty Gritty vacuum machine since 1985... so long as I use quality rcord cleaner fluids it improves any record cleaned by removing microdust that causes pops and will often remove mold release compound still clinging in the groove. Only maintenance needed is periodic replacement of the fabric buffer on the vacuum slot.
Does your cleaning approach meet the following criteria?
1) professional record cleaning solution used to rub into all grooves
2) tight groove contact vacuum applied immediately after record cleaning solution used to removed dissolved solids and soluble material.
If not then your symptom is easily understood, you are creating mud and its being left in the groove.
Does your cleaning approach meet the following criteria?
1) professional record cleaning solution used to rub into all grooves
2) tight groove contact vacuum applied immediately after record cleaning solution used to removed dissolved solids and soluble material.
If not then your symptom is easily understood, you are creating mud and its being left in the groove.