Hi Prep.
A nice collection of coins you,ve inherited there. Certainly not scrap with the 1905 worth about £300 at least in that condition.Best way to clean grubby pre 20s coins is to get a piece of tin foil. Lick the shiny side, put the coin on it, wrap it air proof tight, hold it inside your hand for 3 or 4 minutes, then take it out and wash it with a sponge and warm soapy water. Hey presto like new and no abrasives involved! !