CUSINIUM31-Piece Grill Cleaner Kit: 1 Holder, 20 Screens, 10 Pads

Is this safe to use in Blackstone griddle?

Can these items be put into the dishwasher for reuse?

Will this be good for cast iron ?

I have a fisher & paykel rdv2485gdnn with a commercial-style stainless steel finish. will this be safe to use on my cook too?