@lewm
What detergent do you use?
Detergent can leave a residue if it is in the solution on the record when it dries. When using IPA and a rinse agent, TDS tests on filtered solution done after record cleaning indicate 0001-0005 ppm which is pretty much the same that the test indicates before cleaning records. With that protocol, rinsing is not needed.
99% IPA mixed with distilled water has 0000-0001ppm TDS count. If you filter out the dirt coming off the record during wash, the solution stays clean. I suggest a 0.35 micron filter. However, if you choose a detergent with a high TDS count when mixed with distilled water and do not filter, then yes, rinsing is advisable.
When the solution on a record is clean after wash, then evaporative drying becomes an easy option. With a rinse agent in the solution, the solution sheets off the record when removed from the cleaning machine. Records will dry in ~20 minutes without a fan.
TDS meters are inexpensive, around ~$15. Everyone cleaning records should have one. Alternatively you can measure electrical conductivity. Several meters measure both. I use this one:https://www.amazon.com/TDS-Meter-Digital-Water-Tester/dp/B07Z529M5L/ref=sr_1_3?keywords=7Pros+TDS&qid=1578552765&s=industrial&sr=1-3
I also advocate a distilled water rinse after cleaning with my own mixture of isopropanol, non-ionic detergent, and water. Otherwise, I do believe the detergent can leave a residue
What detergent do you use?
Detergent can leave a residue if it is in the solution on the record when it dries. When using IPA and a rinse agent, TDS tests on filtered solution done after record cleaning indicate 0001-0005 ppm which is pretty much the same that the test indicates before cleaning records. With that protocol, rinsing is not needed.
99% IPA mixed with distilled water has 0000-0001ppm TDS count. If you filter out the dirt coming off the record during wash, the solution stays clean. I suggest a 0.35 micron filter. However, if you choose a detergent with a high TDS count when mixed with distilled water and do not filter, then yes, rinsing is advisable.
When the solution on a record is clean after wash, then evaporative drying becomes an easy option. With a rinse agent in the solution, the solution sheets off the record when removed from the cleaning machine. Records will dry in ~20 minutes without a fan.
TDS meters are inexpensive, around ~$15. Everyone cleaning records should have one. Alternatively you can measure electrical conductivity. Several meters measure both. I use this one:https://www.amazon.com/TDS-Meter-Digital-Water-Tester/dp/B07Z529M5L/ref=sr_1_3?keywords=7Pros+TDS&qid=1578552765&s=industrial&sr=1-3