There are Multiple for all basic types of weapons but the grand exchange is the cheapest and has the most variety.
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A Weapon
Most of the towns in runescape have a general store.
If you have a weapon in your inventory, click on it to wield it. This will un-wield any other weapon you have in your weapon slot.
Any weapon that has a great crush bonus:BattleaxesMacesMaulsWarhammers
all you need to do to get poison off of a weapon is use a cleaning cloth.