i have a maru 4x4 and a ghost hand 3x3. ive been using them for a few months, and i have never lubed them (the ghost hand i got from someone else so he may have lubed it before). when i open them up, the pieces are covered in white plastic dust. if i clean away this dust will it make my cube smoother? and if i want to lube it, should i clean up the dust first?