When I bought my Linn cartridge, which was made by Lyra, my dealer gave me a bottle of the Lyra SPT stylus cleaner. It comes with a minuscule, white applicator brush. After a few drops on the brush, over a period of months, the brush bristles started to get stiff and gunky. Curiously, I dropped some on my finger and it left a sticky residue. Just fyi.
Mine is still working fine. Two years now. It sounds as if you received a defective bottle.
I’d discuss it with the dealer. Somethings amiss IMO.
I just threw it out. I’ll just stick to distilled water.