1955 Sata Italian 25 Cal.

[shanac]

I inherited an Italian 25 Cal. pistol from my grandfather. I've had no need for it until now, as I live in a dangerous part of Atlanta, GA. I'll be using it as a secondary line of defense while walking in the city. I don't know when or if ever he cleaned the gun and I have no idea how to take it apart to do so. It clearly needs it though. If anyone has any idea how to best clean it I'd greatly appreciate it. Down the barrel it says:
Pistola Aut "Sata" Calib. 6.35 Brev. 1955
Magno di Gardone V.T-Brescia- Italia

And on the other side of the barrel is stamped:
PSF 1957

Thanks!!!