Is it the Windex?

Agree he is making it harder to properly clean the LPs.
However, the problem is reversable... You just are nor letting the records soak when you clean them, to finally remove the gunk he is pumping into your grooves

Almost any time someone wet cleans a record without vacuuming it, as far as I'm concerned they are making it much harder to clean effectively even if you have a great cleaning regimen that includes vacuuming. Think about it: anything that is left over in those grooves that dries simply solidifies in there making it that much more difficult to remove.

Most of the "unsalvageable" records I've bought have showed signs of a previous improper wet cleaning, usually evidenced by signs of dried fluid in the leadout grooves. I'd rather buy a record that looks totally filthy and shows no signs of fluid on the record than one that looks not bad but has "dried fluid" anywhere on the record. I would not want to buy a record like that without a return privelege unless it was very cheap.

Thanks for all the input. I've since tried scrubbing for more revolutions, letting the fluid soak a bit, then using Gruv-Glide after and restored the records to "passable". I will have a word or two with the vendor next week, but I think I'll be looking elsewhere unless he's swayed by my comments.

Again propably not the windex,. He doesn't do a proper preclean/wash ala Allsop type wet and scrubbing out the grooves. The usual soft scrub with a more volitile solution will not remove settled petrified deposits in, particular molds, and just any other dried debris.
The soft scrub brush and copiuos rinses will have an effect in my experience. Therefore a generous soaking with a sronger detergent and numerous somewhat firm scrubbs should dislodge debis and fungi. Fungicidal detergents should put that question to bed. The rinse clean is clean to get off the residum soap other noxious chemical and fluid maintaing agents et allis. Residuim is should be removed repetatively using vacuum suction very high power counter with an extremly high torque engine like about thevstrentght of a tractor pull and Nasa wind tunnel suction. This cleaning step is the needed element.
If that fails boil the record for 48 hours min. in a clamp in a pressure cooker at 1k lbs per inch square, but the clamped to avoid warpages and the disc emerges perfectly straight, the grooves will remain on occasion .
THEN get a large colony of the rare emerald green fugus eating Madacasar ants. Apply to the record use a special class 4 biohazard room for this. You must be encolosed in a copletely sealed space type suit. The ants use the record groove dirt fungus as a favored food source, you can get a license for them but you will need years of training. If they get out not even African kller bees can match the extra large but less than needle thin muderously razor sharp pincers which they use to suck the bees dry and very dead, in microseconds.
You will not stop them if that happens or all of mankind will disapear in less than a day. Try to get anything alive out. They will not eclude anything including you. Thus pull the red strap on the emergency packet. As I said these ants will remove the fungus. You won't be troubled by crispy crunchy vinyl again. Or any sound we are sure of. the red pull tag triggers a small nuclear device but its only a risk benefit analysis.
If you are particular, generally speaking clean all oy your records everyday and use an anhydrous ETOH to dry them. Or 10 complete cleanings using a Kieth Monks type RCM will do it.

HILLARIOUS! I am still laughing at Mechans response.