ive got some drain acid I use for outsides the only problem with it is that it strips the chrome off the plugs so I cant use it inside. Ive got some other chemicals I use but im going to try and order a few different ones see which works best for high fats / greasy sinks or any other type of blockages.
for internal sinks / baths ive got the older fashioned type of plunger, I just hold a rag or bag over the over flow pipe and plunger, it usually works fine 90% of the time. Ive got a toilet auger and flexi spring wires for internal. External ive got the plastic lock fast rods, steel rods in two sizes and flexi coil spring rods all from wardflex.
Everytime I come across a different problem I try to buy the equipment / get the knowledge to unblock it easier next time