Very Ruined Fake Syracusean Decadrachm

Hi there,

I came across this very ruined piece, knowing nothing about numismatics, made my research, it must be a copy of a Syracusean decadrachm, it is 4 cm diameter for 19.99 grams

would you try and give it something of a cleaning (how) just for knowing how it was originally (as a fake) ? is it even silver - made ?

It is just so super ruined, even can't see most of the details of the chariots, was it kind of intentional in making it look old, or it can be sort of an "ancient fake" who underwent uncountable vicissitudes ?

Sorry if my questions are dumb, not my field :)