Lubing made 5x5x5 worse
I have a small collection of cubes from various sources, mostly christmas gifts collected over many years, and someone told me I should lube them with silicone spray. So I went and bought a can of "3-in-1 professional" silicone spray from the WD-40 company (so not the actual classic WD-40 fluid, but a silicone spray from the same brand). The actual compound is "(R)-p-mentha-1,8-diene" whatever that might be.
My old 3x3x3 got better pretty much right away. My 4x4x4, which used to be quite stiff, first got even worse but then after a few solves got better than it was before. Quite smooth now, even.
But then the 5x5x5... Even though it wasn't bad at all, I thought I might make it even better by lubing it like the others. I popped a piece out, sprayed, put the piece back in, started turning, and it almost immediately got very hard to turn. I sprayed some more, did a few solves (getting sore hands), then sprayed some more until the fluid was literally dripping out, but it just wouldn't get any better. I kept turning it, then left it for a few days, then tried some more, the inners improved a bit but the outers were still very stiff.
So I thought, maybe this is not the right fluid for this cube (for whatever reason), so I put it under water and kept scrambling it to try and get a decent amount of lube out of the cube. Of course the moist cube, once out of the water, was even worse but once it dried, it got back to more or less what it was like after lubing and before putting it underwater. Still no improvement.
Then I thought, maybe it's not quite dry yet, I'll put it into the freezer, take it out, scramble it and the ice will fall right out. That did indeed work, I did see some ice falling on the floor, and the cube was quite smooth for a few seconds thanks to the ice layer inside, but then of course it started condensing and got worse again. Then I thought, hey, maybe this trick can get more dirt and/or lube out of the cube, so I scrambled it under water again, put it into the freezer just long enough for the water to freeze but without it being impossible to turn, then took it out and watched all the ice fall out as I turned it. Silky smooth until the ice was gone, then back to sticky. After drying up over the course of several days, it's still quite stiff, maybe not quite as bad as after the initial lube but certainly worse than before the whole thing.
So what do I try now? Lube it again? (expecting different results after repeating the same thing...). Use a different lube? Or just give up and buy a new cube? I'm not sure what brand it is, I seem to remember the family member giving it to me proudly proclaiming it was a real Rubik's brand ;-)
I'm not sure whether it might have been lubed before with some kind of household product that might not play nice with the new lube?
Does this sort of thing happen often, cubes getting (and staying) worse after lubing? I'd like to spray my brand new 7x7x7 but now I don't know whether I should.
Thanks,
Michel