07-16-2013, 03:33 PM
If Whink failed it is most likely because it ran off the stain too quickly. When I've used it I've had to set things up so a puddle of Whink would sit on the stain for 10 or 20 minutes. Vinyl next to portholes is sloped so the liquid would run right off. Soaking a rag could work in principle but Whink has hydrofluoric acid (HF)--extremely dangerous and never to be touched. Please be careful if you try it again and read up on HF to make sure you do it safely.


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