The Difference between Maniy, Madhiy and Moisture
Question

I do not know when that which comes out of a woman is Maniy which requires Ghusl or it is regular discharge which requires Wudu'. I have tried to find out more than once, but no one gave me a precise answer. Now I am dealing with all discharges as if they are regular and do not require Ghusl, and I only do Ghusl after intercourse. 
I hope that you can explain the difference between them.
Praise be to Allah.What comes out of a woman may be Maniy, Madhiy or regular discharge , which is called “moisture”. Each of these has its own characteristics and rulings that apply to it. 
Characteristics of Maniy 

It is thin and yellow. This is the description that is narrated from the Prophet (peace and blessings of Allah be upon him): “The water of the man is thick and white, and the water of the woman is thin and yellow.” (Narrated by Muslim, 311)

It may be white for some women. 

It smells like pollen, and the smell of pollen is similar to the smell of dough.
There is pleasure when it is emitted, and desire ceases immediately after it is emitted.

It is not stipulated that all three characteristics appear at once, rather one is sufficient for the ruling on Maniy to apply. This was stated by An-Nawawi in Al-Majmu` (2/141). 
Characteristics of Madhiy
Madhiy is white and thin, and is emitted when feeling desire either when thinking or otherwise, but no pleasure is felt when it is emitted, and desire does not cease when it is emitted.  
Characteristics of moisture
Moisture is the discharge that comes from the uterus ; it is clear and a woman may not notice it. Women vary in the amount they emit. 
The difference between Maniy, Madhiy and moisture
With regard to the differences with regard to rulings between these three things (Maniy, Madhiy and moisture), Maniy is pure and it is not essential to wash it from one’s clothes, but one must do Ghusl after it is emitted, whether that happened when one was asleep or awake , whether it was due to intercourse, an erotic dream or anything else. 
Madhiy is impure and must be washed off if it gets onto the body. As for clothes, if Madhiy gets onto them it is sufficient to purify them by sprinkling them with water. The emission of Madhiy invalidates Wudu' but it is not essential to do Ghusl after it is emitted. 
As for moisture , it is pure and it need not be washed off, and clothes need not be washed if it gets onto them. But it invalidates Wudu', unless it is continuous, in which case a woman should do Wudu' for every prayer after the time for it begins, after which it will not matter if there is any moisture. 
And Allah knows best.