This is a three Microplane household, fine, medium and coarse! Oh, not forgetting the gadget which stops me taking the tops off my fingers when grating that last bit of cheese, chocolate etc!
I've had them for many years though, and they're still super sharp, so they don't owe me anything!
I can't be doing with 'smears' of nothing much on my plate though, and as for 'foam' it reminds me of 'frogspit/cuckoospit' which you see on plants......eugh!
If mashed potatoes need anything apart from best butter, it has to be cheese or fried onions for me!