When it comes to brushing, I HATE the little circular pads. You have to get the hard plastic too close to the stylus, and I don't feel it's effective. I like a brush with longer, more rigid bristles. Soft supple carbon fiber bristles are useless. The white brushes included with Shelter cartridges are PERFECT. The KR Audio $3 brush is OK. If you are nervous with your hands, it helps a LOT to brace your brush hand with the other hand while your work. If the bristles are positioned up & down (relative to cart body) and you move from back to front, it will be hard to hurt anything - but this is mostly useful for cleaning dust from the cover and/or front yoke. It is good to brush with the bristles positioned left to right (great for cantilever cleaning too); just be sure you're only "hitting" the stylus & cantilever with a very small section of bristles from the brush on each stroke. Repeat while hitting the stylus from different angles. Then go up and down the cantilever too (carefully!). That way you don't get horrid crust cemented on cantilever top side, like in the pics that show the supposed Onzow "goo".
I use Magic Eraser (rotationally scrubbing while dipped) and also brush regularly, with dips in DS Audio gel occasionally (when I'm too lazy to be careful with the M.E.). I also used Onzow in the past. I doubt there will be any chance for accumulation of goo with my cleaning regimen. This new "report" is interesting, and I'm sure there will be lots of "hearty" discussion to come, but it certainly doesn't concern me for my own usages.