The commercial guys use Ripcord, too. It is one of the best products, a slightly better one is called Icon, and is available as a granule that you can dissolve and use yourself, a sachet makes about 10 litres. You might have to go to agricultural suppliers for this stuff, though Mitre10 and the like will probably stock it.
The only problem with Ripcord is that it is an emulsifyable concentrate, meaning that it contains a powerful solvent to get the pyrethroid to disperse in the water (it doesn't dissolve). This can cause problems with things like french polished surfaces, where it will attack the wax. In these cases another form, a suspension concentrate, is used called Cislin. It does the same job as it is also a pyrethroid, it is just about 4x the price.
I personally use Ripcord on my house, and have done so for years. I am a commercial horticulturalist so I have access to all of the chemicals and safety equipment.