Water based paint

[toyotaman]

Having just moved I notice that the previous owners of the property have made quite a mess of the paintwork. They have used a water-based emulsion paint on the walls and in doing so have caught the doorframes/skirting boards and radiators with either the roller they used or with a paint brush and have not bothered to clean it off before it dried. My question is how do I remove such areas without causing too much damage to the woodwork or metalwork?
any helpful hints would be welcome
thanks

regards
Dave