Thru hose feeder

I used to have a Phostrogen thru hose feeder. This came in really useful for both feeding plants with any attachment on the hose end, and if you filled it with washing up liquid in made cleaning the car or greenhouse easy! I'm really trying to find another but can only find the spray bottles that go on the end if the hose. Anyone know of a supplier?

 

Miracle Gro do one, dunno if you can refill with whatever you like, or if you have to use their refills?

http://www.lovethegarden.com/produc...-liquafeed-all-purpose-plant-food-starter-kit