Homemade plant fertilizer

A friend of mine told me a very simple recipe of a homemade plant fertilizer. My balcony is full of flowers. I adore them. So I decided to try my friend's tip immediately. And I must admit that it works:-) 

You need: 

Homemade bathroom detergent

It's time to clean:-) What is the sense to prepare your own bathroom detergent if the shops are full of these products? Well, first of all it is easier to make that it seems. Second, it is all natural! And third, it will save your money:-) So, you need: