lube failure

Hello Cubers! I used some cheap lube from Aliexpress to lube my cube. After like 1 or 2 weeks I noticed that the screws and springs had a white-ish film and are on some points a bit rusty. Because I'm new to cubing I actually don't really know how to lube it properly. Maybe it's my fault...

So I was just doing a couple of white cross solves practicing some lookahead and getting great sub 25 solves. I locked up during my PLL and suddenly caught on some pieces of the puzzle while doing a G perm and grabbed some Maru. Like usual, I put one drop on one side of the cube and put...